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