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Girlfriend Collective to Nike leggings size

The short answer

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

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 Nike. Letter sizes on the left, Letter on the right.
Girlfriend CollectiveGirlfriend Collective builds it forNike, by chartSame labelNike builds it forNike also prints
XXSwaist 22 to 24 in, hip 32 to 34 inXXSXXSwaist 21.3 to 23.5 in, hip 30.5 to 33 inUS numeric 0
XSwaist 24 to 26 in, hip 34 to 36 inXSXSwaist 23.5 to 26 in, hip 33 to 35.5 inUS numeric 0-2
Swaist 26 to 28 in, hip 36 to 39 inSSwaist 26 to 29 in, hip 35.5 to 38.5 inUS numeric 4-6
Mwaist 28 to 30.5 in, hip 39 to 41.5 inMMwaist 29 to 31.5 in, hip 38.5 to 41 inUS numeric 8-10
Lwaist 30.5 to 33 in, hip 41.5 to 44 inLLwaist 31.5 to 34.5 in, hip 41 to 44 inUS numeric 12-14
XLwaist 33 to 35.5 in, hip 44 to 46.5 inLXLwaist 31.5 to 34.5 in, hip 41 to 44 inUS numeric 12-14
XXLwaist 35.5 to 39 in, hip 46.5 to 50 inXLXXLwaist 34.5 to 38.5 in, hip 44 to 47 inUS numeric 16-18
XXXLwaist 39 to 42.5 in, hip 50 to 53.5 inXXLnot publishedwaist 38.5 to 42.5 in, hip 47 to 50 inUS numeric 20-22
4XLwaist 42.5 to 46 in, hip 53.5 to 57 in1Xnot publishedwaist 43 to 45.5 in, hip 51 to 54 inUS numeric 18W-20W
5XLwaist 46 to 49.5 in, hip 57 to 60.5 in2Xnot publishedwaist 45.5 to 49 in, hip 54 to 57 inUS numeric 22W-24W
6XLwaist 49.5 to 53 in, hip 60.5 to 64 in3Xnot publishedwaist 49 to 53 in, hip 57 to 61 inUS numeric 26W-28W
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

Nike to Girlfriend Collective