Port Authority vs Sunspel: which size fits the same?
In polos, a Port Authority L is closest to a Sunspel XL (the same around).
Polos
Port Authority polos measure about 3¼″ more around than Sunspel at the same size. A Port Authority L is closest to a Sunspel XL (the same around).
| Port Authority | Chest · length | Closest Sunspel | Chest · length | Sunspel is |
|---|---|---|---|---|
| Port Authority XS | 36½″ · 27½″ | Sunspel S | 37″ · 26½″ | ½″ roomier |
| Port Authority S | 39½″ · 28½″ | Sunspel M | 39¾″ · 27¼″ | the same around |
| Port Authority M | 42½″ · 29½″ | Sunspel L | 42½″ · 28″ | the same around |
| Port Authority L | 45½″ · 30½″ | Sunspel XL | 45¼″ · 28¾″ | the same around |
| Port Authority XL | 48½″ · 31¼″ | Sunspel XXL | 47¾″ · 29½″ | ¾″ snugger |
| Port Authority XXL | 51½″ · 32¼″ | Sunspel 3XL | 50¼″ · 30¼″ | 1¼″ snugger |
| Port Authority 3XL | 55½″ · 32¾″ | none close |
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 Sunspel: Sunspel Riviera Polo Shirt (Slim Fit). Relaxed and oversized cuts are left out.
More: Port Authority sizing · Sunspel 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.