Brand Size Comparison: How Popular Clothing Brands Fit Differently
Author: Stylist and brand team at Tellar
Date: 2025
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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://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.
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