UK Sizing: There Is No Standard, So Publish Measurements

There is no legally enforced UK clothing sizing standard. What exists is convention, shaped by whichever high street brands a particular generation grew up with, and it has drifted over decades. That is why a customer can wear three different sizes in three shops and none of them is wrong.

For a new brand, the consequence is straightforward: your size label is a claim, and your measurements are the evidence. Publish the evidence.

How UK sizing sits against other markets

Broadly, at the same letter or number, UK sizing sits between US and EU conventions — US letter sizing tends to run more generous, and EU numeric sizing maps differently again. A brand importing a size chart written for one market and selling into another will hear about it in returns.

Providing a conversion table is helpful and insufficient, because conversions between three unstandardised systems are approximations of approximations. Measurements are the only thing that transfers cleanly.

What to publish

• Chest width laid flat, which is half the circumference and should be described as such so nobody doubles it twice.
• Body length from the high point of the shoulder, which is the standard reference and avoids the ambiguity of "length".
• Sleeve length, stated from wherever you are measuring it and say where.
• Shoulder width, especially for hoodies and sweatshirts where a dropped shoulder is the defining feature of the fit.
• In centimetres for a UK audience, and in inches too if you sell to the US. Both costs you nothing.

Say what the fit is meant to be

Measurements tell somebody the numbers; they do not tell them the intention. A chest measurement that looks large might be an oversized fit working as designed or a regular fit that runs big, and those call for different ordering decisions from the customer.

One line does it. "Designed with a boxy, oversized fit — take your usual size for the intended look, or size down for a regular fit." That sentence prevents a meaningful proportion of size exchanges, and it costs nothing but the writing of it.

Model information helps more than it should

Height and the size worn, for every model in every shot. It is the single most requested piece of information in apparel ecommerce and it is trivially cheap to capture at the shoot. A customer who can see that a 178cm model is wearing a medium has more usable information than any chart provides.

The grading question

Grading is how measurements change between sizes, and if you are buying an established blank you inherit it. What you need from your supplier is the full measurement table for every size in the run — not just your base size — so you can publish it and so you can check it behaves sensibly at the ends.

Ask for it at sample stage, and where the budget allows, order a size set rather than a single sample. Grading problems live at the extremes of a range and are invisible if you only ever hold a medium.

Ordering across a size range

Mixed sizes are included inside our 50-piece minimum per design, which means a first run can carry a proper spread rather than being forced into one or two sizes by a minimum. Weight it to your best guess, sell it, and let the actual sell-through set the curve for the reorder — which is the only reliable way anybody has ever found the right split.