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Old Navy to Citizens of Humanity jeans size

The short answer

Old Navy 6 is Citizens of Humanity 27 or 28 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 Citizens of Humanity. US numeric sizes on the left, Waist size on the right.
Old NavyOld Navy builds it forCitizens of Humanity, by chartSame labelCitizens of Humanity builds it forCitizens of Humanity also prints
00waist 24 in, hip 34.5 in23 or 24not publishedwaist 23.5 in, hip 33.5 innot published
00waist 24 in, hip 34.5 in23 or 24not publishedwaist 23.5 in, hip 33.5 innot published
2waist 26 in, hip 36.5 in25 or 26not publishedwaist 25.5 in, hip 35.5 inUS numeric 0 · Letter XS
4waist 27 in, hip 37.5 in26 or 27not publishedwaist 26.5 in, hip 36.5 inUS numeric 2 · Letter S
6waist 28 in, hip 38.5 in27 or 28not publishedwaist 27.5 in, hip 37.5 inUS numeric 4 · Letter S
8waist 29 in, hip 39.5 in28 or 29not publishedwaist 28.5 in, hip 38.5 inUS numeric 6 · Letter M
10waist 30 in, hip 40.5 in29 or 30not publishedwaist 29.5 in, hip 39.5 inUS numeric 8 · Letter M
12waist 31.5 in, hip 42 in31not publishedwaist 31.5 in, hip 41.5 inUS numeric 10 · Letter L
14waist 33.5 in, hip 44 in33not publishedwaist 33.5 in, hip 43.5 inUS numeric 12 · Letter XL
16waist 36.3 in, hip 46.5 innot madenot publishednot publishednot published
18waist 39 in, hip 49 innot madenot publishednot publishednot published
20waist 42 in, hip 51.5 innot madenot publishednot publishednot published
22waist 44.3 in, hip 53.8 innot madenot publishednot publishednot 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. 8 sizes have no counterpart on the Citizens of Humanity 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

Citizens of Humanity to Old Navy