Old Navy to adidas size
The short answer
Old Navy XS is adidas M by the two brands' own charts. 8 of 8 Old Navy sizes land on a different label at adidas.
Both brands publish the body chest each size is cut for, so every row matches a chest, not a letter.
On 1 sizes the charts land two or more sizes from the same label. Brands do not measure the body the same way, so on those rows treat the chart answer and the same label as the two ends of a range.
| Old Navy | Old Navy builds it for | adidas, by chart | Same label | adidas builds it for | adidas also prints |
|---|---|---|---|---|---|
| XS | chest 36 to 37 in, neck 13 to 13.5 in, sleeve 31.5 to 32 in | M | XS | chest 36.5 to 39 in, waist 32 to 34.5 in, hip 36.5 to 39 in | not published |
| S | chest 38 to 39 in, neck 14 to 14.5 in, sleeve 32.5 to 33 in | M | S | chest 36.5 to 39 in, waist 32 to 34.5 in, hip 36.5 to 39 in | not published |
| M | chest 40 to 42 in, neck 15 to 15.5 in, sleeve 33.5 to 34 in | L | M | chest 39.5 to 42.5 in, waist 35 to 38 in, hip 39.5 to 42 in | not published |
| L | chest 44 to 46 in, neck 16 to 16.5 in, sleeve 34.5 to 35 in | XL | L | chest 43 to 46.5 in, waist 38.5 to 42 in, hip 42.5 to 45.5 in | not published |
| XL | chest 48 to 50 in, neck 17 to 17.5 in, sleeve 35.5 to 36 in | 2XL | XL | chest 47 to 51 in, waist 42.5 to 47 in, hip 46 to 49 in | not published |
| XXL | chest 51 to 53 in, neck 18 to 18.5 in, sleeve 36.5 to 37 in | 3XL | 2XL | chest 51.5 to 56 in, waist 47.5 to 52 in, hip 49.5 to 53 in | not published |
| XXXL | chest 55 to 57 in, neck 19 to 19.5 in, sleeve 37.5 to 38 in | 3XL | 3XL | chest 51.5 to 56 in, waist 47.5 to 52 in, hip 49.5 to 53 in | not published |
| XXXXL | chest 58 to 60 in, neck 20.5 to 21 in, sleeve 38.5 to 39 in | 3XL | not published | chest 51.5 to 56 in, waist 47.5 to 52 in, hip 49.5 to 53 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
- adidas size guide, read on 2026-09-18. adidas on TrueToSize