Bonobos vs Uniqlo: which size fits the same?

In button-downs, a Bonobos L is closest to an Uniqlo M (¾″ snugger).

Button-downs

Uniqlo button-downs measure about 2¾″ more around than Bonobos at the same size. A Bonobos L is closest to an Uniqlo M (¾″ snugger).

BonobosChest · lengthClosest UniqloChest · lengthUniqlo is
Bonobos XS37½″ · 28¼″none close
Bonobos S40½″ · 29″Uniqlo XS41¼″ · 27½″¾″ roomier
Bonobos M43½″ · 29½″Uniqlo S43¾″ · 28¼″the same around
Bonobos L46½″ · 30¼″Uniqlo M45¾″ · 29″¾″ snugger
Bonobos XL49½″ · 30¾″Uniqlo L49¼″ · 30¼″the same around
Bonobos XXL52½″ · 31½″Uniqlo XL52¼″ · 30¾″the same around

From Bonobos: Bonobos Riviera Short Sleeve Shirt, Standard Fit, Bonobos Riviera Short Sleeve Shirt, Slim Fit, Bonobos Riviera Short Sleeve Shirt, Tailored Fit, Bonobos Riviera Short Sleeve Shirt, Athletic Fit. From Uniqlo: Uniqlo Oxford Slim Shirt, Uniqlo Oxford Regular Shirt, Uniqlo Cotton Linen Shirt | Short Sleeve, Uniqlo Premium Linen Shirt. Relaxed and oversized cuts are left out.

More: Bonobos sizing · Uniqlo sizing

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Garment measurements: the shirt itself, chest all the way around and length from shoulder to hem, from each brand's own chart or wholesale spec sheet, checked November 2026. Shirts with half or more cotton are shown as they come out of a dryer (about 2% less around and 4% shorter). Brands change their cuts, so check the shop's chart before you buy.