Grading: How One Pattern Becomes a Whole Size Range
By The Velocity Wear Team
A garment is patterned in one base size and graded into the rest. Grading is the set of rules describing how each measurement changes between sizes, and it is where a size range is either genuinely wearable across its whole span or technically correct and practically wrong at the ends.
Why uniform scaling fails
Bodies do not scale proportionally. Between a small and a large, chest circumference changes a great deal, arm length changes much less, and neck circumference changes less still. Apply a single multiplier to every measurement and the large has absurdly long sleeves and a gaping neck.
Good grading applies different increments to different measurements, based on how bodies actually vary. That is the craft, and it is why grading is a skilled job rather than a scaling operation.
Where it shows
- **The extremes.** XS and 3XL reveal grading problems that are invisible in the middle sizes, which is why a size set sample matters.
- **Sleeve length on large sizes,** the most common failure. A garment that fits the chest with sleeves past the knuckles.
- **Neck opening on small sizes,** where uniform grading leaves the neck too wide.
- **Body length,** which frequently does not increase enough on larger sizes, producing garments that ride up.
Extended sizing needs more than extra grades
Extending a range by continuing the same grade rules outwards produces garments that are technically in the size range and poorly shaped for the people wearing them. Proportions change beyond a certain point and the pattern needs adjusting rather than merely scaling.
If extended sizes matter to you — and for uniform programmes they should — ask specifically whether the range is graded or genuinely patterned at the extremes. It is a question few buyers ask and manufacturers can answer straightforwardly.
Why grading affects your reorders
Grading held on file is what makes a repeat order match the first. If a pattern is redrawn or regraded between runs, your medium changes, and customers who reorder their usual size return it.
Ask whether your grading is stored against your account, and whether repeat runs are cut from the same pattern. That single question is what separates a garment you can sell repeatedly from one that quietly drifts.
What to do as a buyer
- 1**Ask for the graded measurement chart,** not just the base size. You should hold the numbers for every size you sell.
- 2**Order a size set sample** if you are producing cut-and-sew, and check the extremes rather than the middle.
- 3**Publish the measurements** on your product pages — this is the same data, and it reduces returns.
- 4**Keep the chart with your specification,** so a future supplier can reproduce the same range.
