CAD Pattern Grading • All Markets
Garment Grading Service — Accurate Size Scaling from XS to 4XL for All Markets
Professional garment grading service in Bangladesh with CAD precision. We scale your master pattern to full size ranges using US, UK, EU, and Australian grade rules. From XS to 4XL, our grading ensures consistent fit across all sizes. Fast 3-5 day turnaround, digital file delivery, and industry-standard accuracy. Get a quote for your grading project today.
What Is Garment Grading? — A Plain-English Explanation
Garment grading is the technical process of scaling a master pattern up and down to create multiple sizes. Think of it as photocopying a pattern at different scales—but with precise mathematical rules ensuring each size fits correctly. Grading transforms one base pattern (usually size M or size 10) into a complete size range from XS to 4XL or beyond, maintaining the design's proportions and fit intent across all sizes.
Why Grading Accuracy Matters
Inaccurate grading causes fit problems that drive returns and damage brand reputation. If grade rules are inconsistent, a Medium might fit like a Small while a Large fits like an XL. Customers receive garments that don't match size expectations, leading to frustration and returns. Accurate grading ensures consistent sizing—every size fits as intended relative to the others. For clothing manufacturers in Bangladesh, grading accuracy is essential for quality production and customer satisfaction.
Grading Rules Explained
Grade rules specify how much each measurement changes between sizes. For example, a standard US grade rule might increase chest measurement by 1 inch per size, waist by 0.75 inch, and shoulder by 0.5 inch. These rules ensure proportional scaling. Different markets use different grade rules—US sizing typically uses smaller increments than UK sizing. Professional graders apply these rules systematically to every pattern piece, ensuring consistency across the entire garment. Custom grade rules can be developed for brands with unique fit philosophies.
Master Size as Base
Grading starts from a master size—typically size M (Medium) or size 10 in women's, size L (Large) or size 40 in men's. This master pattern represents the design's ideal proportions and fit. All other sizes are graded from this base using grade rules. The master size should be developed through pattern making and fit testing to ensure it represents your brand's intended fit before grading. If the master pattern has fit issues, grading will amplify those issues across all sizes. We provide tech pack service to develop specifications.
Grading Standards by Market — US, UK, EU, AU Differences
Different markets use different sizing systems and grade rules. A US Medium is not the same as a UK Medium or EU Medium. Understanding these differences is crucial for brands selling internationally. This table shows typical grade rule increments for each major market.
| Market | Size System | Chest Increment | Hip Increment |
|---|---|---|---|
| USA/Canada | Numeric (0, 2, 4...) / Letter (XS, S, M...) | 1 inch (2.54cm) | 1 inch (2.54cm) |
| UK | Numeric (6, 8, 10...) / Letter (XS, S, M...) | 2 inches (5cm) | 2 inches (5cm) |
| EU | Numeric (32, 34, 36...) / Letter | 4cm (1.57 inches) | 4cm (1.57 inches) |
| Australia | Numeric (6, 8, 10...) / Letter | 2 inches (5cm) | 2 inches (5cm) |
| International | Varies by brand | Custom grade rules | Custom grade rules |
Why the Same "Medium" Differs by Market
A US Medium typically measures 38-40 inches chest, while a UK Medium measures 40-42 inches, and an EU Medium measures 48-50cm (approximately 19-20 inches). These differences stem from historical sizing conventions and body measurement averages in each region. US sizing runs smaller than UK sizing, which runs smaller than EU numeric sizing. Brands selling internationally must account for these differences to ensure customers receive the expected fit. SDF grades to each market's standards, providing separate graded patterns for each target market.
Multi-Market Grading
For brands selling across multiple markets, we provide multi-market grading from the same master pattern. This means you receive separate graded pattern sets for US, UK, EU, and Australian markets, each with appropriate grade rules. This approach ensures each market's customers receive garments sized according to local expectations. Multi-market grading costs slightly more than single-market grading but eliminates fit confusion and returns from size mismatch. Our fit engineering service can help develop master patterns that grade well across all markets.
Importance of Fit Blocks
Fit blocks are basic pattern shapes representing your brand's fit philosophy—slim, regular, relaxed, or oversized. Each fit block has its own grade rules. A slim-fit block grades with smaller increments than a relaxed-fit block. Developing fit blocks before grading ensures consistency across your product line. SDF can develop fit blocks based on your target customer measurements, then grade all patterns from these blocks for consistent sizing across your brand.
CAD Grading vs Manual Grading
Garment grading can be performed manually using rulers and grading machines, or digitally using CAD (Computer-Aided Design) software. While both methods can produce accurate results, CAD grading offers significant advantages in speed, accuracy, and flexibility. Most modern production uses CAD grading for efficiency and precision.
| Factor | CAD Grading | Manual Grading |
|---|---|---|
| Accuracy | High (0.1mm precision) | Medium (human error possible) |
| Speed | Fast (3-5 days) | Slow (7-14 days) |
| Cost | Medium ($30-50/size) | Low ($20-40/size) |
| Ease of Changes | Easy (digital editing) | Difficult (redraw required) |
| File Output | Digital (DXF, PLT, PDF) | Physical paper or scanned |
| Best for | Production, complex garments | Simple projects, small batches |
Software Used for CAD Grading
SDF uses industry-standard CAD software including Gerber AccuMark, Lectra Modaris, and Optitex. These systems provide precision grading with 0.1mm accuracy, automated grade rule application, and instant visualization of graded nests. The software stores grade rules for reuse across your product line, ensuring consistency. CAD systems also integrate directly with cutting machines, enabling seamless transition from grading to production. Our investment in CAD technology ensures your graded patterns are production-ready and accurate.
Digital File Formats
We deliver graded patterns in industry-standard digital formats compatible with most production systems. DXF (Drawing Exchange Format) is the most common format, readable by virtually all CAD systems and cutting machines. PLT (HPGL plotter format) is used for direct plotting to paper patterns. PDF format provides visual reference and is useful for documentation. We can also provide AAMA or ASTM standard formats if required by your production facility. Digital files enable instant transmission worldwide and easy archiving for future production runs.
Size Chart Development — Building Your Brand's Size Standards
Every brand needs its own size chart rather than following generic market standards. Generic size charts don't account for your target customer's body measurements or your brand's fit philosophy. Developing a custom size chart ensures your garments fit your specific customer base consistently across all products. This section explains how to build effective size charts.
Why Brands Need Custom Size Charts
Generic size charts are based on average body measurements that may not match your target demographic. A brand targeting young women needs different measurements than a brand targeting mature women. A streetwear brand targeting Gen Z needs different sizing than a corporate wear brand targeting professionals. Custom size charts reflect your customer's actual measurements, reducing returns and improving fit perception. Customers who consistently fit your size across products develop brand loyalty based on reliable sizing.
Building Size Charts from Target Customer
Start by gathering body measurement data from your target customer. This can come from anthropometric studies, customer surveys, fitting sessions with representative models, or industry body measurement databases. Identify key measurements for your product category: chest, waist, hip, inseam, sleeve length, shoulder width, etc. Determine your fit philosophy—slim, regular, relaxed, or oversized—and apply ease allowances accordingly. Ease is the difference between body measurement and garment measurement. Build your size chart with these measurements, ensuring consistent grade rules between sizes. Our low MOQ clothing manufacturers support size chart development.
Plus Size Grading
Plus size grading requires different rules than standard grading. Body proportions change differently at larger sizes—hip-to-waist ratio increases, arm circumference grows disproportionately, and torso length may not scale linearly. Standard grade rules applied to plus sizes create fit problems like gaping armholes or insufficient hip room. SDF uses specialized plus-size grade rules that account for these proportional changes. We grade to extended sizes up to 6XL or 7XL with accurate fit. Learn more about our plus-size clothing manufacturing and sustainable clothing manufacturing capabilities.
Kids Grading
Children's clothing grading uses age-based sizing rather than body measurements. Size 2T fits an average 2-year-old, size 4T fits a 4-year-old, and so on. Grade rules for kids are based on growth charts showing average measurements by age. However, body measurements vary significantly within age groups, so fit blocks are particularly important for kids' wear. SDF provides kids' grading using standard age-based grade rules or custom rules based on your target demographic. Contact us about kids clothing manufacturing with accurate sizing.
Example Size Chart
Below is an example women's size chart showing key measurements across standard sizes. Your brand's chart should include all measurements relevant to your product category. This chart illustrates consistent grade rules—each measurement increases by a predictable amount between sizes.
| Size | XS | S | M | L | XL | XXL | 3XL |
|---|---|---|---|---|---|---|---|
| Bust (in) | 32 | 34 | 36 | 38 | 40 | 42 | 44 |
| Waist (in) | 24 | 26 | 28 | 30 | 32 | 34 | 36 |
| Hip (in) | 34 | 36 | 38 | 40 | 42 | 44 | 46 |
| Length (in) | 24 | 24.5 | 25 | 25.5 | 26 | 26.5 | 27 |
Grading for Different Garment Categories
Different garment categories require different grading approaches. Tops focus on upper body measurements, bottoms on lower body, dresses combine both, and knitwear accounts for stretch. Understanding category-specific grading ensures accurate fit across all product types. SDF grades all garment categories with appropriate specialized rules.
Tops and Shirts
Top grading focuses on chest, shoulder, sleeve length, and neck measurements. Chest increases by the standard grade rule (1 inch for US, 2 inches for UK) per size. Shoulder width typically increases by 0.5 inch per size. Sleeve length increases by 0.5-0.75 inch per size depending on style. Neck circumference increases proportionally to maintain collar fit. Armhole grading must balance with sleeve circumference to ensure proper fit. Our pattern making service develops top patterns with accurate grade rule integration.
Trousers and Bottoms
Bottom grading emphasizes waist, hip, rise, and inseam measurements. Waist and hip follow standard grade rules. Rise (front and back) increases by smaller increments (0.25-0.5 inch per size) to maintain proportion. Inseam increases by 0.5-1 inch per size depending on style—shorts may not grade inseam at all, while trousers grade more. Thigh circumference grades proportionally to hip. Pocket placement must be graded to maintain position relative to waist and hip. Accurate bottom grading is essential for fit and comfort.
Dresses
Dress grading combines top and bottom grading since dresses cover both body regions. Bodice grading follows top rules for chest, shoulder, and sleeve. Skirt grading follows bottom rules for waist, hip, and length. The waist seam must align perfectly between bodice and skirt grading to ensure the dress assembles correctly. Waist measurement must match at the seam line. Dress grading requires careful coordination between upper and lower grade rules to maintain overall proportion. Our fit engineering service ensures dresses grade seamlessly.
Knitwear
Knitwear grading accounts for fabric stretch, which affects fit. Stretch fabrics require less ease than woven fabrics, so grade rules may be smaller. However, excessive stretch can cause garments to grow over time, so graders must balance stretch recovery with ease. Ribbing and cuffs often don't grade significantly to maintain elasticity. Knitwear grading also considers fabric weight—heavier knits may require different grade rules than lightweight knits. SDF's expertise in knitwear production ensures accurate grading for stretch fabrics. We serve clothing manufacturers for startups with specialized grading.
Outerwear
Outerwear grading includes extra ease for layering. Jackets and coats are designed to fit over other garments, requiring larger grade rules than base layers. Sleeve length grades more to accommodate layered sleeves. Shoulder width increases for layering room. Length grades more to cover longer torsos in layered outfits. Outerwear also includes specialized features like linings, interlinings, and insulation that must grade proportionally. Our garment development service handles complex outerwear grading. We offer full package production for complete projects.
Common Grading Mistakes That Cause Fit Problems
Graded samples are essential for verifying accuracy before bulk production. Our sampling service produces graded samples for fit testing, ensuring your size range performs as expected. Submit a sample request to get started. We also provide private label manufacturing and certification verification services.
Grading Service Process at SDF
SDF's grading process is streamlined for accuracy and efficiency. From master pattern receipt to digital file delivery, we ensure your graded patterns meet production standards. Our process typically takes 3-5 business days, with rush options available for urgent projects.
Provide Master Pattern
Submit your master pattern in CAD format (DXF, PLT, PDF) or as physical pattern. Specify the base size (usually M or size 10) and any special requirements. If you need pattern creation first, we offer pattern making service. Physical patterns are digitized before grading. Ensure your master pattern is finalized and fit-approved—grading amplifies any fit issues in the master.
Confirm Size Range and Market
Specify the size range you need (e.g., XS-4XL or S-3XL) and target market (US, UK, EU, AU). We'll confirm appropriate grade rules for your market. US uses 1-inch increments, UK uses 2-inch increments, EU uses 4cm increments. Multi-market brands can receive separate graded versions for each market. We also confirm if you need standard or custom grade rules.
Grading Rules Agreed and Applied
We apply industry-standard grade rules or your custom grade rules. Grade rules specify measurement increments between sizes (e.g., 1-inch chest increase per size). We confirm rules before grading to ensure accuracy. For custom fit philosophies, we develop grade rules based on your size chart. CAD software applies rules automatically with 0.1mm precision to all pattern pieces.
Graded Nest Reviewed and Approved
We provide a graded nest showing all sizes for your review. The nest displays how each size relates to the master pattern, enabling you to verify proportional accuracy. Review the nest for consistency and fit intent. We make adjustments if needed before final delivery. This review step ensures quality before production and prevents fit issues.
Digital Files Delivered for Production
Upon approval, we deliver individual pattern files for each size in your required format (DXF, PLT, PDF). Files are production-ready for cutting and manufacturing. We also provide size charts and measurement specs for reference. Files are delivered digitally via email or file transfer. Physical paper patterns are available upon request for an additional charge.
Garment Grading Service FAQ
What is the difference between grading and sizing?
Grading is the technical process of scaling a pattern up and down to create multiple sizes from a master pattern. Sizing refers to the actual measurements and size labels used in your brand's size chart. Grading is the mechanical process of applying grade rules, while sizing is the strategic decision of what measurements each size represents. Grading creates the patterns; sizing defines the fit target.
How many sizes can you grade from one master pattern?
We can grade from one master pattern to create any size range you need—typically XS to 4XL (7 sizes) or S to 3XL (5 sizes). We can also grade to extended plus sizes up to 6XL or 7XL using specialized plus-size grade rules. The number of sizes depends on your target market and brand positioning. We grade to US, UK, EU, and Australian standards as required.
How long does garment grading take?
Standard garment grading takes 3-5 business days from receipt of master pattern. Complex garments with multiple pieces or special requirements may take 5-7 business days. Rush grading is available for urgent projects. CAD grading is faster than manual grading, typically completing in 3-4 days. We provide digital files in DXF, PLT, or PDF formats upon completion.
How much does garment grading cost?
Garment grading costs vary by complexity and number of sizes. Basic tops typically cost $30-50 per size, bottoms $40-60 per size, and complex garments $50-80 per size. Discounts apply for larger size ranges. Contact us for a specific quote based on your pattern. Grading is more cost-effective than creating separate patterns for each size. Use our price calculator for estimates.
Can you grade to plus sizes from a standard pattern?
Yes, we grade to plus sizes using specialized plus-size grade rules. Plus-size grading differs from standard grading because body proportions change differently at larger sizes—we account for increased hip-to-waist ratio, arm circumference, and other proportional adjustments. We use industry-standard plus-size grade rules to ensure proper fit across extended size ranges. Learn more about our plus-size clothing manufacturing capabilities.
What file format do you deliver graded patterns in?
We deliver graded patterns in industry-standard digital formats including DXF (Drawing Exchange Format), PLT (HPGL plotter format), and PDF. DXF is the most common format compatible with most CAD systems and cutting machines. We can also provide AAMA or ASTM standard formats if required. Physical paper patterns are available upon request for an additional charge.
Do you grade using US, UK or EU standards?
We grade using US, UK, EU, and Australian standards based on your target market. Each market has different sizing systems and grade rules. US sizing typically uses 1-inch increments for chest, UK uses 2-inch increments, EU uses 4cm increments, and Australia follows UK standards with some variations. We apply the appropriate grade rules for your target market to ensure accurate fit. Multi-market brands can receive multiple graded versions.
What is a graded nest in pattern making?
A graded nest is a pattern layout showing all graded sizes nested together on a single sheet. This visual representation allows you to review the grade rules and ensure proportional accuracy across sizes. The nest shows how each size relates to the master pattern and whether grade rules are consistent. We provide graded nest files for review before final pattern delivery, enabling you to verify accuracy before production.
Ready to Grade Your Patterns?
Get accurate CAD grading from XS to 4XL for US, UK, EU, and Australian markets. Fast 3-5 day turnaround with digital file delivery. Contact us for a quote on your grading project.
| Mistake | Garment Effect | Prevention |
|---|---|---|
| Uniform grading (same increment all sizes) | Larger sizes fit too tight, smaller sizes too loose | Use proportional grade rules based on body measurement data |
| Ignoring stretch in knits | Knit garments grow or shrink inconsistently | Apply reduced grade rules for stretch fabrics, test stretch recovery |
| Not grading collar/neckline separately | Necklines gape or are too tight across sizes | Grade neck circumference proportionally to maintain collar fit |
| Forgetting to grade button/zip placements | Closures misaligned, plackets uneven | Grade all placement marks and notches with pattern pieces |
| Not testing grade on physical garment | Fit issues discovered only after bulk production | Produce graded samples for fit testing before production |