Port Authority vs Uniqlo: which size fits the same?
In polos, a Port Authority L is closest to a Uniqlo L (the same around).
Polos
Port Authority and Uniqlo polos measure about the same at the same size (within ¾″ around). A Port Authority L is closest to a Uniqlo L (the same around).
| Port Authority | Chest · length | Closest Uniqlo | Chest · length | Uniqlo is |
|---|---|---|---|---|
| Port Authority XS | 36½″ · 27½″ | Uniqlo XS | 37¾″ · 25″ | 1¼″ roomier |
| Port Authority S | 39½″ · 28½″ | Uniqlo S | 40¼″ · 26¼″ | ¾″ roomier |
| Port Authority M | 42½″ · 29½″ | Uniqlo M | 42¾″ · 27″ | the same around |
| Port Authority L | 45½″ · 30½″ | Uniqlo L | 45½″ · 28¼″ | the same around |
| Port Authority XL | 48½″ · 31¼″ | Uniqlo XL | 48½″ · 29″ | the same around |
| Port Authority XXL | 51½″ · 32¼″ | Uniqlo XXL | 51″ · 29¼″ | ½″ snugger |
| Port Authority 3XL | 55½″ · 32¾″ | Uniqlo 3XL | 54″ · 30″ | 1½″ snugger |
From Port Authority: Port Authority Silk Touch Polo (K500), Port Authority Dry Zone UV Micro-Mesh Polo (K110), Port Authority Core Classic Pique Polo (K100). From Uniqlo: Uniqlo DRY-EX Polo Shirt, Uniqlo AIRism Cotton Pique Polo Shirt, Uniqlo DRY Pique Polo Shirt. Relaxed and oversized cuts are left out.
More: Port Authority sizing · Uniqlo sizing
Get your exact size in any of these
Add three shirts you own that fit well. FitCard compares their real measurements with every shirt here and tells you the one size to buy, and why, in terms of your own shirts. Free, no tape measure.
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.