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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.

Every Old Navy size read across to Reformation. US numeric sizes on the left, Waist size on the right.
Old NavyOld Navy builds it forReformation, by chartSame labelReformation builds it forReformation also prints
00waist 24 in, hip 34.5 in23 or 24not publishedwaist 23.5 in, hip 34 innot published
00waist 24 in, hip 34.5 in23 or 24not publishedwaist 23.5 in, hip 34 innot published
2waist 26 in, hip 36.5 in25 or 26not publishedwaist 25.5 in, hip 36 innot published
4waist 27 in, hip 37.5 in26 or 27not publishedwaist 26.5 in, hip 37 innot published
6waist 28 in, hip 38.5 in27 or 28not publishedwaist 27.5 in, hip 38 innot published
8waist 29 in, hip 39.5 in28not publishedwaist 28.5 in, hip 39 innot published
10waist 30 in, hip 40.5 in29not publishedwaist 30 in, hip 40.5 innot published
12waist 31.5 in, hip 42 in30not publishedwaist 31.5 in, hip 42 innot published
14waist 33.5 in, hip 44 in31not publishedwaist 33.3 in, hip 43.8 innot published
16waist 36.3 in, hip 46.5 in32 or 31not publishedwaist 38.5 in, hip 49 innot published
18waist 39 in, hip 49 in33not publishedwaist 39 in, hip 50 innot published
20waist 42 in, hip 51.5 in36not publishedwaist 42 in, hip 53 innot published
22waist 44.3 in, hip 53.8 in38not publishedwaist 44 in, hip 55 innot published
24waist 46.6 in, hip 56.1 innot madenot publishednot publishednot published
26waist 49 in, hip 58.5 innot madenot publishednot publishednot published
28waist 51.5 in, hip 61 innot madenot publishednot publishednot published
30waist 54 in, hip 63.5 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 4 sizes have no counterpart on the Reformation chart. Read from the two charts only; no formula and no averaging.

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.

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Sources

Reformation to Old Navy