Old Navy to Reformation jeans size
The short answer
Old Navy 10 is Reformation 29 by the two brands' own charts.
Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.
| Old Navy | Old Navy builds it for | Reformation, by chart | Same label | Reformation builds it for | Reformation also prints |
|---|---|---|---|---|---|
| 00 | waist 24 in, hip 34.5 in | 23 or 24 | not published | waist 23.5 in, hip 34 in | not published |
| 00 | waist 24 in, hip 34.5 in | 23 or 24 | not published | waist 23.5 in, hip 34 in | not published |
| 2 | waist 26 in, hip 36.5 in | 25 or 26 | not published | waist 25.5 in, hip 36 in | not published |
| 4 | waist 27 in, hip 37.5 in | 26 or 27 | not published | waist 26.5 in, hip 37 in | not published |
| 6 | waist 28 in, hip 38.5 in | 27 or 28 | not published | waist 27.5 in, hip 38 in | not published |
| 8 | waist 29 in, hip 39.5 in | 28 | not published | waist 28.5 in, hip 39 in | not published |
| 10 | waist 30 in, hip 40.5 in | 29 | not published | waist 30 in, hip 40.5 in | not published |
| 12 | waist 31.5 in, hip 42 in | 30 | not published | waist 31.5 in, hip 42 in | not published |
| 14 | waist 33.5 in, hip 44 in | 31 | not published | waist 33.3 in, hip 43.8 in | not published |
| 16 | waist 36.3 in, hip 46.5 in | 32 or 31 | not published | waist 38.5 in, hip 49 in | not published |
| 18 | waist 39 in, hip 49 in | 33 | not published | waist 39 in, hip 50 in | not published |
| 20 | waist 42 in, hip 51.5 in | 36 | not published | waist 42 in, hip 53 in | not published |
| 22 | waist 44.3 in, hip 53.8 in | 38 | not published | waist 44 in, hip 55 in | not published |
| 24 | waist 46.6 in, hip 56.1 in | not made | not published | not published | not published |
| 26 | waist 49 in, hip 58.5 in | not made | not published | not published | not published |
| 28 | waist 51.5 in, hip 61 in | not made | not published | not published | not published |
| 30 | waist 54 in, hip 63.5 in | not made | not published | not published | not published |
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
- Reformation size guide, read on 2026-09-18. Reformation on TrueToSize