Old Navy to adidas leggings size
The short answer
Old Navy XXS is adidas XS by the two brands' own charts. 5 of 10 Old Navy sizes land on a different label at adidas.
Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.
On 2 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 |
|---|---|---|---|---|---|
| XXS | waist 24 in, hip 34.5 in | XS | 2XS | waist 24 to 26 in, hip 33.5 to 35.5 in, inseam 31 in | US numeric 0-2 |
| XS | waist 25 to 26 in, hip 35.5 to 36.5 in | XS | XS | waist 24 to 26 in, hip 33.5 to 35.5 in, inseam 31 in | US numeric 0-2 |
| S | waist 27 to 28 in, hip 37.5 to 38.5 in | S | S | waist 26.5 to 28.5 in, hip 36 to 38 in, inseam 31 in | US numeric 4-6 |
| M | waist 29 to 30 in, hip 39.5 to 40.5 in | M | M | waist 29 to 31 in, hip 38.5 to 40.5 in, inseam 31.5 in | US numeric 8-10 |
| L | waist 31.5 to 33.5 in, hip 42 to 44 in | L | L | waist 31.5 to 33.5 in, hip 41 to 43 in, inseam 31.5 in | US numeric 12-14 |
| XL | waist 36.3 to 39 in, hip 46.5 to 49 in | 1X | XL | waist 35 to 38.5 in, hip 43.5 to 47 in, inseam 31 in | US numeric 14W-16W |
| XXL | waist 42 in, hip 51.5 in | 2X | 2XL | waist 39 to 42.5 in, hip 47.5 to 51 in, inseam 31 in | US numeric 18W-20W |
| 2X | waist 42 to 44.3 in, hip 51.5 to 53.8 in | 3X | 2X | waist 43 to 46.5 in, hip 51.5 to 55 in, inseam 30.5 in | US numeric 22W-24W |
| 3X | waist 46.6 to 49 in, hip 56.1 to 58.5 in | 4X | 3X | waist 47 to 50.5 in, hip 55.5 to 59 in, inseam 30 in | US numeric 26W-28W |
| 4X | waist 51.5 to 54 in, hip 61 to 63.5 in | 4X | 4X | waist 47 to 50.5 in, hip 55.5 to 59 in, inseam 30 in | US numeric 26W-28W |
What wearers say
Charts describe a garment. People who own both brands describe a fit, and their answer ranks above this table once five of them stand behind it. Pick your size in the converter to see whether there are enough yet.
Sources
- Old Navy size guide, read on 2026-09-17. Old Navy on TrueToSize
- adidas size guide, read on 2026-09-18. adidas on TrueToSize