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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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