Brand Size Comparison: How Popular Clothing Brands Fit Differently

If you’ve ever worn a size 10 in one store and a size 14 in another, you’re not imagining things. Sizing inconsistencies are one of the biggest challenges in fashion retail – especially when shopping online. Tellar.co.uk solves this by comparing your measurements with real brand data from over 1,500 clothing stores.

Here’s a breakdown of how different UK and international brands typically size up – so you know what to expect.

Brand	Runs	Fit Notes
Zara	Small	Tends to run narrow at the waist and hips, especially in trousers and dresses.
H&M	Small	Fitted tops and dresses run tight; divided line is especially petite.
ASOS	True to Size	Generally consistent, but 'ASOS Design' may vary by item style.
M&S	Large	More generous fit, especially in everyday wear and older demographic ranges.
New Look	True to Size	Slightly fitted in bust/waist but usually aligned with UK sizing.
River Island	Small	Slim fit, especially around the hips and legs.
Next	True to Size	Stable sizing for most categories, reliable for workwear and casuals.
PrettyLittleThing	Small	Tight across bust and hips, bodycon and cut-outs are often ultra-slim.
Boohoo	Small	Trendy fits are often snug, especially in stretch and partywear.
Topshop	Small	Vintage legacy cuts are slim, especially trousers and crop tops.
COS	Large	Scandi oversized aesthetic, with generous cuts in shoulders and chest.
& Other Stories	Slightly Small	Better aligned to European sizing; consider sizing up.
Mango	Small	Continental fit – narrower in hips and chest, more structured tailoring.
Primark	Varies	Inconsistent; some items run large (basics), others very fitted (trendy).
John Lewis	Large	Classic fit designed for comfort, not fashion-forward tightness.
Net-a-Porter	Varies	Depends on designer; many luxury brands run small (e.g., Valentino, Isabel Marant).

💡 Want to skip the guessing? Just use [Tellar.co.uk](https://www.tellar.co.uk/) to find your exact size in all of these brands, based on your real body measurements. It's free, fast, and works across 1,500+ fashion retailers.

➡️ Check your size now: /store-size-lookup/

➡️ Create a free sizing profile: /log-in-page/

➡️ Print your free measuring tape: /free-measuring-tape/