Does Port Authority run big or small?
Port Authority polos run true to size, within ¾″ of other brands at the same size.
Polos: true to size, within ¾″ of other brands at the same size
| Size | Port Authority chest · length | Other brands (typical) | Port Authority is |
|---|---|---|---|
| XS | 36½″ · 27½″ | 37″ · 27½″ | ½″ snugger |
| S | 39½″ · 28½″ | 40″ · 28¼″ | ½″ snugger |
| M | 42½″ · 29½″ | 42¾″ · 29″ | the same around |
| L | 45½″ · 30½″ | 45¾″ · 29¾″ | the same around |
| XL | 48½″ · 31¼″ | 48¾″ · 30¾″ | the same around |
| XXL | 51½″ · 32¼″ | 52″ · 31¾″ | ½″ snugger |
| 3XL | 55½″ · 32¾″ | 57″ · 33″ | 1½″ snugger |
Port Authority polos here: Port Authority Silk Touch Polo (K500), Port Authority Dry Zone UV Micro-Mesh Polo (K110), Port Authority Core Classic Pique Polo (K100). Compared with 31 polos from other brands.
Port Authority compared with
adidas · Asket · J.Crew · Mack Weldon · Nike · Polo Ralph Lauren · Sport-Tek · Sunspel · TravisMathew · Under Armour · Uniqlo
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.