UK sizing conventions for knitwear are not standardised — and what a Turkish factory produces as 'M' may not match what a UK customer expects as 'M'. Here is how to specify sizes correctly from the start.
Sizing is one of the most common sources of disappointment in first knitwear orders — and it is almost always avoidable. The fundamental problem is that size labels (S/M/L/XL) are not standardised across the industry: what a factory defines as "M" may be sized for a European market, an export market, or simply the factory's own internal standard, none of which necessarily aligns with what your UK customer expects when they order a medium. The solution is to specify sizes by measurement — in centimetres, on a measurement chart, at every size — and to check the first sample against those measurements before approving. This guide covers the UK sizing conventions, grading rules, and measurement chart structure that every UK knitwear brand needs to communicate clearly to their factory.
| Size label | Chest (to fit) | Half chest (garment) | Body length | Sleeve length |
|---|---|---|---|---|
| XS | 76–81 cm | 42–44 cm | 55–58 cm | 58–60 cm |
| S | 82–87 cm | 45–47 cm | 58–61 cm | 60–62 cm |
| M | 88–94 cm | 48–50 cm | 61–64 cm | 62–64 cm |
| L | 95–102 cm | 51–54 cm | 64–67 cm | 64–66 cm |
| XL | 103–110 cm | 55–58 cm | 67–70 cm | 66–68 cm |
| 2XL | 111–120 cm | 59–62 cm | 69–72 cm | 68–70 cm |
Note: these are typical measurements for a regular-fit women's or unisex jumper. Oversized fits carry 8–14 cm additional chest measurement per size. Men's knitwear typically runs 2–4 cm larger on chest at each label. Always specify your target fit on the tech pack (slim fit / regular fit / relaxed fit / oversized) alongside the measurements.
Grading is the process of scaling a garment pattern up and down from the base size. For UK women's knitwear, the standard grade increment between adjacent sizes (e.g. S to M) is typically 4 cm on half chest (which equals 8 cm on full chest circumference). Body length grades are smaller — 1.5–2.5 cm per size. Sleeve length grades are 1–2 cm per size. These grade increments should be specified on your measurement chart for every size, not left to the factory's discretion. If a factory applies European grade increments (often 5 cm half-chest per size), your garments will be noticeably larger per size jump than UK customers expect.
The base size is the size you approve the first sample in — all other sizes are graded from this. For UK women's knitwear, M is the standard base size. For men's, L is typical. Choose the base size that best represents your target customer and fits your production sample model or fit model. All measurements on the size chart relate back to the base size; the factory grades up and down from the approved base. Request the full graded measurement chart from the factory before approving bulk — check that grades have been applied correctly to every measurement point, not just chest.
A minimum knitwear measurement chart should include: half chest (measured 2.5 cm below armhole, across the garment), body length (CB neck to hem), sleeve length (CB neck to cuff), shoulder width (seam to seam or across back for seamless), armhole depth, neck width and cuff circumference. Specify whether measurements are taken flat (laying the garment flat and measuring across) or in the round — most knitwear measurements are given flat (half-chest, not full circumference). Specify measurements in centimetres; tolerance of ±1.5–2 cm is standard for knitwear.
Knitwear fabric stretches. Rib fabric stretches significantly; firm double-knit or heavily structured fabric stretches less. Measurements should always be taken in the relaxed state (garment laid flat, not stretched). If you also want to know the stretched measurement (important for rib-heavy styles that must fit over the head or across the hips despite appearing narrow at rest), request both relaxed and maximum stretch measurements from the factory for the rib sections. For care labels and product page size guides, always use relaxed flat measurements.
| Market | Label "M" half chest | Fit expectation | Notes |
|---|---|---|---|
| UK women's | 47–49 cm | Regular/relaxed | UK standard; tends slightly more generous than Europe |
| European women's | 45–47 cm | More fitted | UK M ≈ EU L in many brands |
| US women's | 48–51 cm | Regular/relaxed | US sizing slightly larger; UK M ≈ US S or XS in some brands |
| Turkish factory default | Varies — confirm | Often EU/export standard | Always supply your own measurement chart; never rely on factory's size table |
UK plus-size knitwear (UK sizes 16–26, corresponding to 2XL–5XL approximately) is an underserved segment at mid-premium price points. Most Turkish knitwear factories can produce extended sizes without additional machine changeover — flat-knit machines adjust stitch count and length by programme. The grade increments above UK 2XL typically increase slightly: 5–6 cm per size on half chest rather than the standard 4 cm. Body length grades remain similar, but sleeve circumference grades increase to accommodate larger upper arms. Confirm with your factory that their size 3XL–5XL production capability is based on actual pattern grading, not simply stretching the XL programme.
A common grading error at plus sizes is applying the correct chest grade but neglecting to grade body length and sleeve length proportionately. A UK size 20 customer is not only wider — they are often proportionally taller in the body and may need longer sleeves. If your size 3XL garment uses the same body length as size XL but with a 20 cm wider chest, the proportions will look wrong on a larger body. At minimum, continue body length grading by 1.5–2 cm per size all the way through your extended size range, and consider an additional sleeve length grade of 0.5 cm per size above XL.
Neckline width and armhole depth are measurement points that brands commonly forget to grade at larger sizes. A neckline width that works at size S (approximately 16–18 cm) does not automatically work at size 4XL — without grading, the neck opening becomes proportionally too small relative to the larger chest width and can restrict dressing, particularly for a style pulled on over the head. Grade neckline width by 0.5 cm per size jump. Grade armhole depth by 0.75–1 cm per size jump above XL to accommodate larger upper arms comfortably.
A clearly presented size guide on your product page reduces size-related returns significantly. UK consumers want to know: what are the garment measurements, not just the label. A table showing half-chest and body length for each size (in centimetres) allows a customer to measure a garment they know fits well and compare — this single element reduces size-related returns more than any other product page change. Include a "how to measure" illustration and a "if between sizes, size up" recommendation for styles with a fitted silhouette. For oversized styles, include a note on the fit intent: "modelled in size S for an oversized look; fits UK size 8–14".
When you place an order with us, we work from your measurement chart — not from our factory's standard size grid. Send us your measurements in centimetres for your base size and we'll build the grade across your full size range and confirm measurements on every sample before bulk. Getting sizing right at the sample stage protects your returns rate and your customer satisfaction post-launch.
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