Garment Size Grading Explained — How Patterns Scale Across Sizes

What Is Grading?

Grading is the technical process of creating patterns in multiple sizes from a base size. A grader takes your sample pattern and mathematically scales it up and down to create sizes XS through XXL.

Proper grading maintains the design integrity across all sizes. The proportions stay consistent. The fit characteristics remain the same. This ensures that a medium and an XXL both fit your target customer correctly.

Poor grading causes fit problems. Sleeves may become too long in larger sizes. Waist may sit incorrectly. Proportions may look wrong. Good grading is essential for brand reputation.

Standard Grade Rules

Standard grade rules define how much measurements change between sizes. These rules vary by garment type and target market. Common grade rules specify chest, waist, length, and sleeve increments.

For tops, chest typically increases by 4-5 centimeters between sizes. Length increases by 1-2 centimeters. Sleeve length increases by 1.5-2 centimeters.

For bottoms, waist increases by 4-5 centimeters between sizes. Hip increases by 5-6 centimeters. Inseam increases by 1.5-2 centimeters. These increments create consistent fit across sizes.

XS to XXL Grading

Standard size ranges include XS, S, M, L, XL, and XXL. Some brands include XXXL. The base size is typically M or L. Grading radiates outward from the base size.

XS is typically two sizes down from M. XXL is typically two sizes up from L. The total range from XS to XXL represents four size steps from the base.

Consider your target market. European markets may use different size naming. Asian markets may have different body proportions. Adjust grade rules for your specific market.

Plus Size Grading

Plus size grading requires special consideration. Body proportions change differently in larger sizes. Standard grade rules may not work well for plus sizes.

Plus size grading often uses different increments. Armholes may need larger increases. Length may need different proportions. Waist-to-hip ratio may differ from standard grading.

Work with experienced pattern makers for plus size grading. SDF Clothing has experience with plus size grading and can provide guidance on appropriate grade rules.

Petite Grading

Petite grading adjusts for shorter body proportions. Standard grading may produce garments that are too long for petite customers. Length reductions are needed.

Petite grading typically reduces overall length by 5-10 centimeters. Sleeve length may also be reduced. Torso length is adjusted for shorter proportions.

Width measurements may follow standard grade rules. The focus is on length adjustments to maintain proper proportions for petite frames.

Custom Grade Rules

Custom grade rules create a unique brand fit. If your brand targets a specific body type, standard grade rules may not be ideal. Custom rules ensure consistent fit for your target customer.

Develop custom grade rules based on your target market measurements. Analyze your customer data. Adjust increments to match your customer's body proportions.

Custom grade rules become part of your brand identity. Consistent fit across seasons builds customer loyalty. Customers learn they can trust your sizing.

Common Grading Mistakes

Uneven grading is a common mistake. If chest increases too much but length does not increase enough, proportions become wrong. The garment may look boxy in larger sizes.

Ignoring armhole grading causes fit problems. Armholes must increase proportionally with body size. Too-small armholes restrict movement in larger sizes.

Not grading details like pockets and plackets causes design inconsistency. These details should scale proportionally with the garment.

Grading Cost and Timeline

Grading cost depends on complexity. Simple garments with few pieces cost less to grade. Complex garments with many pieces cost more.

Typical grading cost ranges from $50 to $200 per style. This includes creating patterns in all requested sizes. Custom grade rules may cost more.

Grading timeline is typically 3-5 days. Rush grading may be available for additional cost. Plan grading into your production timeline.

Grading FAQ

What size should I use as the base for grading? Use your most common size as the base. For most brands, this is M or L. Grading outward from your base size ensures the best fit for your core customer.

Can I grade my own patterns? Grading requires specialized knowledge and software. Professional graders have experience with complex garments. DIY grading often leads to fit problems.

How many sizes should I offer? Most brands offer 5-6 sizes. XS through XXL covers most customers. Consider your target market when deciding size range.

Do I need to grade for every style? Yes. Each style requires individual grading. However, you can use consistent grade rules across your collection for brand consistency.

What if grading produces poor fit? Review your grade rules. Adjust increments based on fit feedback. Work with your grader to refine the rules. Multiple grading rounds may be needed.

Can manufacturers do grading for me? Yes. Most manufacturers offer grading services. SDF Clothing provides professional grading as part of our production service.

For a complete overview of clothing manufacturers in Bangladesh — including pattern making, grading, and sizing — read our complete clothing manufacturers guide.