Old Navy to Patagonia size
The short answer
Old Navy XS is Patagonia S by the two brands' own charts. 3 of 8 Old Navy sizes land on a different label at Patagonia.
Both brands publish the body chest each size is cut for, so every row matches a chest, not a letter.
| Old Navy | Old Navy builds it for | Patagonia, by chart | Same label | Patagonia builds it for | Patagonia also prints |
|---|---|---|---|---|---|
| XS | chest 36 to 37 in, neck 13 to 13.5 in, sleeve 31.5 to 32 in | S | XS | chest 37 in, hip 36 in, sleeve 33 in | not published |
| S | chest 38 to 39 in, neck 14 to 14.5 in, sleeve 32.5 to 33 in | S or M | S | chest 37 in, hip 36 in, sleeve 33 in | not published |
| M | chest 40 to 42 in, neck 15 to 15.5 in, sleeve 33.5 to 34 in | M | M | chest 40 in, hip 39 in, sleeve 34 in | not published |
| L | chest 44 to 46 in, neck 16 to 16.5 in, sleeve 34.5 to 35 in | L | L | chest 44 in, hip 43 in, sleeve 35 in | not published |
| XL | chest 48 to 50 in, neck 17 to 17.5 in, sleeve 35.5 to 36 in | XXL | XL | chest 50 in, hip 49 in, sleeve 37 in | not published |
| XXL | chest 51 to 53 in, neck 18 to 18.5 in, sleeve 36.5 to 37 in | XXL | XXL | chest 50 in, hip 49 in, sleeve 37 in | not published |
| XXXL | chest 55 to 57 in, neck 19 to 19.5 in, sleeve 37.5 to 38 in | XXXL | XXXL | chest 56 in, hip 55 in, sleeve 37.5 in | not published |
| XXXXL | chest 58 to 60 in, neck 20.5 to 21 in, sleeve 38.5 to 39 in | XXXL | not published | chest 56 in, hip 55 in, sleeve 37.5 in | not published |
What wearers say
Charts describe a garment, not a fit. We do not collect fit reports for this category yet, so this table is the two brands' own claims and nothing more.
Sources
- Old Navy size guide, read on 2026-09-18. Old Navy on TrueToSize
- Patagonia size guide, read on 2026-09-18.