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Girlfriend Collective to Old Navy leggings size

The short answer

Girlfriend Collective XL is Old Navy L by the two brands' own charts. 6 of 11 Girlfriend Collective sizes land on a different label at Old Navy.

Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.

Every Girlfriend Collective size read across to Old Navy. Letter sizes on the left, Letter on the right.
Girlfriend CollectiveGirlfriend Collective builds it forOld Navy, by chartSame labelOld Navy builds it forOld Navy also prints
XXSwaist 22 to 24 in, hip 32 to 34 inXXSXXSwaist 24 in, hip 34.5 inUS numeric 00
XSwaist 24 to 26 in, hip 34 to 36 inXSXSwaist 25 to 26 in, hip 35.5 to 36.5 inUS numeric 0-2
Swaist 26 to 28 in, hip 36 to 39 inSSwaist 27 to 28 in, hip 37.5 to 38.5 inUS numeric 4-6
Mwaist 28 to 30.5 in, hip 39 to 41.5 inMMwaist 29 to 30 in, hip 39.5 to 40.5 inUS numeric 8-10
Lwaist 30.5 to 33 in, hip 41.5 to 44 inLLwaist 31.5 to 33.5 in, hip 42 to 44 inUS numeric 12-14
XLwaist 33 to 35.5 in, hip 44 to 46.5 inLXLwaist 31.5 to 33.5 in, hip 42 to 44 inUS numeric 12-14
XXLwaist 35.5 to 39 in, hip 46.5 to 50 inXLXXLwaist 36.3 to 39 in, hip 46.5 to 49 inUS numeric 16-18
XXXLwaist 39 to 42.5 in, hip 50 to 53.5 inXXLnot publishedwaist 42 in, hip 51.5 inUS numeric 20
4XLwaist 42.5 to 46 in, hip 53.5 to 57 in2Xnot publishedwaist 42 to 44.3 in, hip 51.5 to 53.8 inUS numeric 20-22
5XLwaist 46 to 49.5 in, hip 57 to 60.5 in3Xnot publishedwaist 46.6 to 49 in, hip 56.1 to 58.5 inUS numeric 24-26
6XLwaist 49.5 to 53 in, hip 60.5 to 64 in4Xnot publishedwaist 51.5 to 54 in, hip 61 to 63.5 inUS numeric 28-30
Tinted rows change label or sit between two sizes. 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 Girlfriend Collective