This page explains what grading is and how one base pattern produces every other size in a size range, for anyone who checks a graded pattern set before a bulk approval: a buyer, a merchandiser, a pattern maker, or a new entrant. This lesson teaches a one-step check: confirming that a size range was graded from a stated base size using a documented grade rule, rather than each size being drafted on its own.
A buyer reviewing a tech pack ahead of a bulk approval can assume every size in a range was drafted separately, each checked against its own measurement chart. Order A's own T-shirt is instead built the other way: one base pattern, commonly size M or L, is scaled up or down by a fixed grade rule to produce every other size.
Without checking that the grade rule was actually followed at every point on the pattern, a buyer can approve a size range where one size fits well and another fits poorly, a problem discovered only once garments reach the shop floor or the customer, far later than the pattern stage where it is cheapest to catch.
You need: nothing but this page. T05-C03-L01 (what a pattern is) is useful background, not required.
By the end of this lesson you can:
Not covered here: what a pattern is and why it already includes seam allowance (lesson T05-C03-L01); what a marker is and how pattern pieces are arranged on fabric for cutting (lesson T05-C03-L03); calculating marker efficiency and fabric wastage (lesson T05-C03-L04); building a complete marker-planning worksheet for an order (lesson T05-C03-L05).
| Term | Meaning |
|---|---|
| Pattern | The template a garment is cut from, with the seam allowance already added beyond the garment's finished dimensions. |
| Grading | Scaling a base pattern up or down to produce every size in a size range, following a fixed grade rule. |
| Base size | The size a grade rule is applied to as the starting point for producing every other size in the range. |
| Grade rule | The set amount added or removed at each specific point on a pattern, for each size step away from the base size. |
| Size range | The full set of sizes an order offers, for example S M L XL. |
| Size ratio | The split of an order's total quantity across the sizes offered, for example 1:2:2:1 for S:M:L:XL. |
Grading is scaling a base pattern, usually a size in the middle of a size range, up or down to produce every other size in that range, following a fixed grade rule: a set amount added or removed at specific points on the pattern for each size step. Order A's own fixed size run, S M L XL at a ratio of 1:2:2:1, is the size range a grading exercise produces from one base size, commonly M or L in a range like this. Grading is not the same as scaling the whole pattern up or down by one uniform percentage. Different points on a garment, such as the chest, the body length and the sleeve, often grade by different amounts between adjacent sizes, reflecting how a person's body actually varies from one size to the next.
A person checking a graded pattern set meets the same few variants across knit and woven garments, and across export and domestic orders alike, because grading is a general sizing method, not a fact tied to one specific order.
| What can differ | The shapes you meet | Why it matters |
|---|---|---|
| Base size pattern | The starting pattern a grade rule is applied to, commonly a middle size such as M or L | Every other size is checked against this one pattern's own measurements, not against each other |
| Graded-up size | A size such as XL, produced from the base by adding the grade rule's stated amount at each point, once per size step above the base | A size two steps above the base, such as XL from a base of M, should differ from the base by twice the grade rule's per-step amount at each point |
| Graded-down size | A size such as S, produced from the base by removing the grade rule's stated amount at each point | The same grade rule applies in reverse; a size below the base is not drafted by a separate, unrelated method |
| Uneven grading across points | A real grade rule often adds more at the chest than at the sleeve length between adjacent sizes, since body proportions do not scale uniformly | A pattern where every point grades by the same amount usually signals an undocumented shortcut, not a real grade rule |
| Whether the grade rule is documented | An export tech pack states the grade rule for each construction point in writing, for a Make to Order buyer such as Northline Apparel; some factories work from an unwritten, standing convention instead | Either way, one specific amount per point is assumed; a sample that departs from it, documented or not, is still a grading error |
Northline Apparel's buyer, reviewing Order A's tech pack ahead of a bulk approval, checks that the size range S M L XL has been graded from a stated base size using a documented grade rule, rather than each size being drafted independently, which risks inconsistent fit across the range. Order A is a Make to Order export batch: Delta Garments cuts and sews the batch only once Northline Apparel's buyer has approved the graded pattern set the tech pack describes.
Order A's own fixed size-M measurements are the base this worked example starts from: half chest 53 cm, sleeve length 22 cm. This lesson's own grade rule, stated in Order A's tech pack, adds 4 cm at the chest and 1 cm at the sleeve for each size step. One step up from the base M produces the L pattern.
The same grade rule, applied twice, produces XL: a chest of 61 cm (53 + 4 + 4) and a sleeve length of 24 cm (22 + 1 + 1). Applied once in reverse, it produces S: a chest of 49 cm and a sleeve length of 21 cm.
The methodA common mistake is assuming that grading means uniformly scaling every dimension of a pattern by the same amount between adjacent sizes. A real grade rule usually varies by construction point: Order A's own worked grade rule adds 4 cm at the chest between sizes but only 1 cm at the sleeve length. Treating grading as simple uniform scaling produces an odd, unnatural fit progression across the size range, and a sample checked against that wrong assumption can be wrongly approved, or wrongly rejected, at the pattern stage.
Grading means starting from one pattern, called the base size, and changing its measurements by a fixed, documented amount to produce every other size in a size range. The amount added or removed is not the same at every point on the garment. A T-shirt's chest measurement might change by 4 cm between sizes, while its sleeve length changes by only 1 cm, because a person's body does not grow by the same amount everywhere between one size and the next. A buyer checking a graded size range compares each size's actual measurements to what the stated base size and grade rule say they should be. A size that does not match its own documented grade rule at every point is a grading error, whether or not it looks obviously wrong when the garment is held up.
Northline Apparel's buyer is reviewing Order A's graded pattern set before approving it for bulk production. The facts in front of the buyer:
The document the buyer reads, the grade rule and the two samples' own measurements, exactly as quoted:
Does the L sample match the stated grade rule? Decide before you open the answer.
No. The chest measurement matches the stated grade rule exactly, but the sleeve length does not.
Two facts, together, decide this. First, the chest: 57 cm is 4 cm more than the base-M chest of 53 cm, exactly one size step at the grade rule's stated +4 cm. Second, the sleeve length: 26 cm is 4 cm more than the base-M sleeve length of 22 cm, but the grade rule states only +1 cm per size step for the sleeve, so the expected L sleeve length is 23 cm, not 26 cm.
The buyer should flag the sleeve length as a grading error and ask Delta Garments to correct the L pattern's sleeve to match the documented grade rule, rather than approving the size range as it stands. Approving it unchanged would carry the same 3 cm sleeve error into every L-size garment cut from this pattern.
This lesson's cost is framed qualitatively, since no fixed price is attached to a grading error in this academy's own facts. Shipping a size range with an undocumented or inconsistent grade rule risks garments that fit progressively worse at the extreme sizes, such as S and XL, since a small, uncaught error at one size step compounds at every step further from the base.
That problem is usually discovered through customer returns rather than at the pattern stage, where it is far cheaper to catch and correct. The base-and-direction check in this lesson's own method exists to prevent exactly this: confirming a size's measurements match its own documented grade rule before a buyer approves bulk production, not after garments have already been cut, sewn and shipped.
Copy this row into the marker-planning worksheet. Fill it from what was actually measured on the sample, not from what the tech pack is assumed to say.
| Size (steps from base) | Grade rule says | Found (your entry) | Result |
|---|---|---|---|
| L (one step above base M) | Chest +4 cm, sleeve +1 cm |
Download the full working sheet, with rows for every size this course covers, from the link on this course's page.
1. What is grading?
2. Does a grade rule typically add or remove the same amount at every point on the pattern between adjacent sizes?
3. If a grade rule specifies +1 cm sleeve length per size step but a sample one step from the base shows +4 cm, what should happen?
| EN | AR | FR | TR | Meaning |
|---|---|---|---|---|
| Pattern | الباترون | Patron | Kalıp | The template a garment is cut from, with the seam allowance already added beyond the garment's finished dimensions. |
| Grading | التدريج | Gradation | Gradasyon | Scaling a base pattern up or down to produce every size in a size range, following a fixed grade rule. |
| Base size | المقاس الأساسي | Taille de base | Temel beden | The size a grade rule is applied to as the starting point for producing every other size in the range. |
| Grade rule | قاعدة التدريج | Règle de gradation | Gradasyon kuralı | The set amount added or removed at each specific point on a pattern, for each size step away from the base size. |
| Size range | نطاق المقاسات | Gamme de tailles | Beden aralığı | The full set of sizes an order offers, for example S M L XL. |
| Size ratio | نسبة المقاسات | Ratio des tailles | Beden oranı | The split of an order's total quantity across the sizes offered, for example 1:2:2:1 for S:M:L:XL. |
You now know what grading is and how a base pattern produces every other size in a size range. The next lesson moves from one pattern's own sizes to how a full set of pattern pieces is arranged on fabric for cutting, a separate step called a marker. Back to the course map