UniqlovsCOS, Size Comparison
Uniqlo tends to run smaller than COS. If you wear a Medium at COS, you may need a Large at Uniqlo. For a measurement-based recommendation, use the fit checker.
Uniqlo vs COS sizing, quick answer
Uniqlo runs about one size smaller than COS. If you wear a Medium at COS, you'll likely need a Large at Uniqlo. For an exact recommendation, build a free fit profile.
- Uniqlo: fits true to size
- COS: runs large
- If between sizes: size up at the brand that runs smaller, or use the fit checker below for a personalised recommendation.
Brand guide
Compare how Uniqlo and COS usually fit, where cuts feel slimmer or roomier, and which categories are most predictable.
GENERAL BRAND GUIDANCE
This is a general brand-level sizing summary, not an exact product recommendation. For your specific size, paste a product link into the fit checker.
The Verdict
Uniqlo sizing compared to COS: Uniqlo fits true to size while COS runs large. Here is how the sizes translate.
Uniqlo tends to run smaller than COS. If you wear a Medium at COS, you may need a Large at Uniqlo. For a measurement-based recommendation, use the fit checker.
Category Match-up
Size Conversion Table
* Indicative only. For your personalised size at both brands,
Common Questions
Does Uniqlo run smaller than COS?
Uniqlo runs about one size smaller than COS. If you wear a Medium at COS, you'll likely need a Large at Uniqlo. For an exact recommendation, build a free fit profile.
Should I size up or down at Uniqlo vs COS?
Size up one at Uniqlo compared to COS. Uniqlo runs smaller, so if you wear a Medium at COS, try a Large at Uniqlo, especially for fitted tops and tailored bottoms.
If I'm a Medium at Uniqlo, what size am I at COS?
Since Uniqlo runs smaller than COS, a Medium at Uniqlo is roughly equivalent to a Small at COS. Use the ThisFits fit checker for a recommendation based on your measurements.
Does Uniqlo or COS fit differently by category?
Yes, fit varies meaningfully by category. Tops, Bottoms, Outerwear can each fit differently than the brand's overall tendency suggests. See the Category Match-up section below for per-category guidance.
Which brand is more accurate to its size chart, Uniqlo or COS?
Uniqlo and COS both publish official size charts, but real-world fit varies by fabric, cut and category. The ThisFits engine cross-references published charts with shopper fit reports across 197+ brands to predict your size in each.
What if I'm between sizes at Uniqlo and COS?
If you're between sizes, Uniqlo tends to fit closer to the body, so trying the larger size first usually means fewer returns. Always confirm each retailer's return policy before ordering.