COSvsArket, Size Comparison
Arket tends to run smaller than COS. If you wear a Medium at COS, you may need a Large at Arket. For a measurement-based recommendation, use the fit checker.
COS vs Arket sizing, quick answer
Arket runs about one size smaller than COS. If you wear a Medium at COS, you'll likely need a Large at Arket. For an exact recommendation, build a free fit profile.
- COS: runs large
- Arket: fits true to size
- 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 COS and Arket 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
COS sizing compared to Arket: COS runs large while Arket fits true to size. Here is how the sizes translate.
Arket tends to run smaller than COS. If you wear a Medium at COS, you may need a Large at Arket. 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 COS run smaller than Arket?
Arket runs about one size smaller than COS. If you wear a Medium at COS, you'll likely need a Large at Arket. For an exact recommendation, build a free fit profile.
Should I size up or down at COS vs Arket?
Size up one at Arket compared to COS. Arket runs smaller, so if you wear a Medium at COS, try a Large at Arket, especially for fitted tops and tailored bottoms.
If I'm a Medium at COS, what size am I at Arket?
Since Arket runs smaller than COS, a Medium at COS is roughly equivalent to a Large at Arket. Use the ThisFits fit checker for a recommendation based on your measurements.
Does COS or Arket fit differently by category?
Yes, fit varies meaningfully by category. Tops, Bottoms 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, COS or Arket?
COS and Arket 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 COS and Arket?
If you're between sizes, Arket 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.