Plus Size Grading: Why Extended Sizes Are Not Scaled Up

The instinct is to treat an extended size as the approved fit, enlarged. In knitwear that assumption fails late, after the fabric is cut. This page covers where a grade breaks first, which points carry a top and which points carry a bottom, and what can be settled on paper before sampling. It is for buyers adding extended sizes to a style that already sells.

Why is a plus size not the base block made bigger?

A plus size is not the base block made bigger. It is the standard block re-graded, because different points of measure grow at different rates — and the size where those rates stop agreeing is the size that fits wrong.

Enlarging a block multiplies it by one factor: every circumference, depth and length grows in proportion, so the garment stays a photocopy of the fit. Grading moves each point by its own amount, taken from your size chart and from the body that chart describes. Both methods agree at the base size. They part company a size later, and nothing on the sample table shows it until a tape goes on the garment.

Why does the armhole fail before anything else?

The armhole is the first point to complain because it is bounded on two sides. Widen the chest and the front and back panels grow sideways; deepen the armhole at the same rate and the opening drops, but the sleeve cap still has to cover a curve it was not drafted for. The garment then pulls under the arm, the sleeve twists off the shoulder line, and lifting an arm lifts the whole bodice with it.

None of that reads as a sizing error on a hanger. It reads as a construction fault, which is why it can survive a fit review and surface once the range is in production. A pattern check catches it earlier: armhole depth, sleeve cap height and cross-shoulder, compared size by size, before the marker is laid.

Which points carry a top, and which carry a bottom?

A grade is not one list of points. A top is carried by chest, shoulder, armhole, sleeve length and body length; a bottom by waist, hip and rise, with inseam and waistband tension underneath. Copy a rate across the two and the garment fails where they meet.

Point group	On a top	On a bottom	What a copied rate does
Width	Chest and waist	Waist and hip	Seat pulls, side seam swings forward
Depth	Armhole depth and neck drop	Rise, front and back	Armhole cuts into the arm, rise sits low
Length	Body length from the high point of the shoulder, sleeve length	Inseam and outseam	Hem rides up, cuff breaks above the ankle
Tension	Neckband and cuff recovery	Waistband tension	Band rolls or digs in at the top of the range
Alignment	Cross-shoulder and shoulder slope	Hip curve and thigh line	Shoulder seam sits off the joint, thigh twists

Our hoodie range runs XS to 3XL as standard, graded to your market’s size chart rather than a generic block, with 4XL–5XL on request; the range and build options sit on the hoodie manufacturer page.

Bottoms are ordered differently. Waistband tension and rise are adjusted at each size so the fit holds at the top of the range, and waist, hip, rise and inseam are confirmed on the sample before the range is graded, as set out on the yoga wear manufacturer page.

Why does the base size decide the whole grade?

Every other size is derived from the base size, so an error there is not corrected further down the run, it is distributed. Two base sizes produce two ranges from the same end measurements: one where the middle fits and the ends drift, one where the ends fit and the middle is tight. The base size is also the size the fit was approved on, which is why it belongs on paper beside the size run and the treatment of each point, in the fields set out in the knitwear tech pack template.

The paper check is one question: which size is the base, and what does each point do from there? If the answer is “the sample size”, the grade has no anchor, and every size above it repeats it.

Does the largest size need its own sample?

Yes, and so does every size between the ends. A size set is only evidence if each garment in it is measured; a range confirmed on the base size alone is a promise rather than a check. We work to measurements across the full size run against your spec sheet, not just the sample size. Which stage carries that work, and who signs it off, is set out in the sample types and rounds guide.

For a plus size the check is not only the tape. The garment is worn, because a waistband that measures correctly can still roll, and an armhole that measures correctly can still cut. Put the largest size on a body before the grade is released, not after the first carton is opened.

Why are tolerances tighter at the top of the range?

A tolerance is an allowance for making the garment, not for designing it. Applied to a larger circumference or a deeper rise, the same allowance buys less: a band that is slightly narrow rolls on a larger waist where it would sit flat on a smaller one, and a grading error repeats at every point it touches. That is why the tolerance is written per point, at the sample stage, and not inherited from the base size.

Fabric weight belongs in the same conversation, because hoodie fabric alone runs 240–550 gsm and a heavier loopback moves differently from a lighter jersey. Inspection is the end of that chain, not the plan. Bulk runs through 100% inspection and is accepted to AQL 2.5: measurement is checked against the size spec and its tolerances on a pull of each size rather than a visual scan, and finished cartons are sampled for major defects, as the AQL 2.5 inspection page explains. None of that recovers a tolerance that was never agreed.

Does a plus size change the minimum order or the packing?

The minimum does not move. It stays 100 pcs per style, per colour, with 200 pcs on bonded or seam-sealed builds, and sizes mix inside that quantity. Packing changes in one place: fabric use per garment rises towards the top of the range, and the carton ratio has to be reset because fewer pieces of the largest size fit a carton; how that ratio is set is on the bulk packing and shipping page.

Grading itself is a fixed cost carried by the number of sizes rather than the number of pieces, which is why an order at 100 pcs can still hold a full run, as the 100 piece order page explains. Adding a size costs pattern work, adding a colour a minimum.

What has to be settled before the grade is cut?

Six lines on one page remove most of the surprises:

Base size and the full size run, written on the same line of the spec.
The body the chart describes: US, EU or Asian grading, not a generic block.
What each point does from the base size, point by point.
Tolerance per point, agreed at sampling rather than at inspection.
For bottoms, waistband tension and rise at each size, confirmed on the sample.
One sample per size in the run, with the largest one worn and signed.

A minimum of 100 pcs per style, per colour applies to that run, with sizes mixed inside it. Grading, sampling and bulk run in our own plants, not a third party: 18,000+ m² across two plants, 180+ staff and 150,000–200,000 pcs per month, so a correction found at sampling is fixed before the line is set. The rest is a sampling question, and the sample approval checklist covers what to look at.

Send the size run you want to sell, the base size you have already fitted, and the chart your market uses. We will confirm what the grade has to hold at each end before a sample is cut. First sample takes 3–7 working days; bulk takes 15–25 days after sample approval and deposit.

What do buyers ask most about plus size grading?

Can you produce plus size in every style you make?

Any size set you specify, including plus size, petite, tall, maternity and kids, on US, EU or Asian grading. The size is graded from the standard block rather than scaled up, so the construction stays the one you approved on the sample. The block is the limit, not the style list.

Is there a maximum size you can grade to?

XS to 3XL as standard, 4XL–5XL on request. We do not publish a ceiling beyond that, because the answer depends on the block, the fabric weight and the chart your market uses rather than on a number we can promise in advance. Send the top size you need and we will confirm it against the pattern before quoting.

Do plus sizes cost more per piece?

Fabric use per garment rises towards the top of the range, so the material share of the piece is larger and the marker has to be laid differently. Grading is carried by the number of sizes, not by the size itself. The minimum does not move: it stays 100 pcs per style, per colour, whatever the size mix inside it.

Can we grade to our own size chart instead of yours?

Yes. Send the chart with the base size marked and the measurement for each point at each size, and state the market it belongs to, because US, EU and Asian grading do not describe the same body. If the chart is incomplete, we will ask which size the fit was approved on before filling the gaps.

Why does the same size letter fit differently from another supplier?

Because the letter is only a label; the measurements behind it come from a base size and a set of increments that are not universal. Two ranges can both call a size XL and differ at the chest, the armhole and the rise. Compare flat measurements at the points you care about, not the letter on the label.

Can we skip the largest sizes in the first sample round?

You can, but the grade is then untested at the end where it is most likely to fail. A sample per size in the run is what turns a chart into evidence, and the largest size is the one to wear rather than measure alone. Adding those sizes later means a second sample round and a later bulk date.