Mack Weldon vs Port Authority: which size fits the same?
In polos, a Mack Weldon L is closest to a Port Authority L (the same around).
Polos
Mack Weldon and Port Authority polos measure about the same at the same size (within ¾″ around). A Mack Weldon L is closest to a Port Authority L (the same around).
| Mack Weldon | Chest · length | Closest Port Authority | Chest · length | Port Authority is |
|---|---|---|---|---|
| Mack Weldon S | 41″ · 27½″ | Port Authority S | 39½″ · 28½″ | 1½″ snugger |
| Mack Weldon M | 43″ · 28½″ | Port Authority M | 42½″ · 29½″ | ½″ snugger |
| Mack Weldon L | 45½″ · 29¾″ | Port Authority L | 45½″ · 30½″ | the same around |
| Mack Weldon XL | 48″ · 30½″ | Port Authority XL | 48½″ · 31¼″ | ½″ roomier |
| Mack Weldon XXL | 50″ · 31″ | Port Authority XL | 48½″ · 31¼″ | 1½″ snugger |
From Mack Weldon: Mack Weldon Heavyweight Slub Polo, Mack Weldon SILVER Pique Polo. 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). Relaxed and oversized cuts are left out.
More: Mack Weldon sizing · Port Authority 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.