What Is Size Grading in Clothing Manufacturing?
How one sample pattern becomes a full size range – and why it decides whether your XS and XXL fit as well as your M.
Size grading is the process of scaling a base pattern, usually your sample size, up and down into the other sizes in your range. Each measurement grows or shrinks by a set amount between sizes, called a grade rule. Good grading keeps the same fit and proportions across XS to XXL; poor grading is a common reason customers return the smallest and largest sizes.
How grading works
A pattern is first made and approved in one base size, often M for menswear or S/M for womenswear. The grader then applies grade rules – the change in each measurement from one size to the next – to create the other sizes.
| Example grade (illustrative) | S | M (base) | L | XL |
|---|---|---|---|---|
| Half chest | 52 cm | 55 cm | 58 cm | 61 cm |
| Body length | 68 cm | 70 cm | 72 cm | 74 cm |
In this example the chest grows by 3 cm and the length by 2 cm per size. Real grade rules depend on your fit, your customers and the product.
Why grading matters
- Consistent fit: an oversized hoodie should feel equally oversized in S and XL.
- Fewer returns: badly graded extremes are a classic source of complaints.
- Proportions: pockets, logos and trims may need to scale too – or stay fixed.
Uniform vs varied grading
Some ranges use the same increment between every size. Others use bigger jumps at the larger sizes, or a separate block for plus sizes, because bodies do not scale in a straight line. For streetwear with a deliberately boxy fit, length is often graded more gently than width.
What to send your factory
- Your size chart with every point of measure, in cm or inches.
- The base size you want sampled.
- Grade rules if you have them – or let us propose them from your base size.
- Tolerances: how much each measurement may vary.
- Notes on what should not scale, such as logo size or pocket position.
No size chart yet? Start with our size charts and adapt them. We build patterns to your measurements and grade them across your range.
Checking the grade
For a new fit, consider asking for the smallest and largest sizes as extra samples, or a size set, before bulk. It is the surest way to see that the grade works for your customers. Use our sample checklist when they arrive.
In practice: we make and grade the pattern for every cut and sew order. Ordering for a club with juniors and seniors? See the team uniform size guide and teamwear for clubs.
Common follow-up questions
Who does the grading – me or the factory?
Either. You can send your own grade rules, or we grade the approved base pattern to your size chart.
Can I add plus sizes later?
Yes, but plus sizes often need their own grade or block to fit well. Tell us early so we can plan the pattern.
Do logos change size between sizes?
Only if you want them to. Many brands keep one logo size across most sizes and scale only for the extremes.
Can I order a size set before bulk?
Ask us when you quote. A size set lets you check the grade across your range.
Related answers and guides
Want a fit that works in every size?
Send us your size chart or reference garment. We will reply with a free quote and sampling plan.