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Citizens of Humanity to Old Navy jeans size

The short answer

Citizens of Humanity 31 is Old Navy 12 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 Citizens of Humanity size read across to Old Navy. Waist size sizes on the left, US numeric on the right.
Citizens of HumanityCitizens of Humanity builds it forOld Navy, by chartSame labelOld Navy builds it forOld Navy also prints
22waist 22.5 in, hip 32.5 innot madenot publishednot publishednot published
23waist 23.5 in, hip 33.5 in00not publishedwaist 24 in, hip 34.5 inLetter XXS
24waist 24.5 in, hip 34.5 in00 or 0not publishedwaist 24 in, hip 34.5 inLetter XXS
25waist 25.5 in, hip 35.5 in0 or 200waist 25 in, hip 35.5 inLetter XS
26waist 26.5 in, hip 36.5 in2 or 42waist 26 in, hip 36.5 inLetter XS
27waist 27.5 in, hip 37.5 in4 or 64waist 27 in, hip 37.5 inLetter S
28waist 28.5 in, hip 38.5 in6 or 86waist 28 in, hip 38.5 inLetter S
29waist 29.5 in, hip 39.5 in8 or 108waist 29 in, hip 39.5 inLetter M
30waist 30.5 in, hip 40.5 in1010waist 30 in, hip 40.5 inLetter M
31waist 31.5 in, hip 41.5 in1210waist 31.5 in, hip 42 inLetter L
32waist 32.5 in, hip 42.5 in12 or 1412waist 31.5 in, hip 42 inLetter L
33waist 33.5 in, hip 43.5 in1412waist 33.5 in, hip 44 inLetter L
34waist 34.5 in, hip 44.5 in14 or 1614waist 33.5 in, hip 44 inLetter L
Tinted rows change label or sit between two sizes. 1 sizes have no counterpart on the Old Navy 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

Old Navy to Citizens of Humanity