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Girlfriend Collective to Under Armour leggings size

The short answer

Girlfriend Collective XS is Under Armour XXS by the two brands' own charts. 8 of 11 Girlfriend Collective sizes land on a different label at Under Armour.

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 Under Armour. Letter sizes on the left, Letter on the right.
Girlfriend CollectiveGirlfriend Collective builds it forUnder Armour, by chartSame labelUnder Armour builds it forUnder Armour also prints
XXSwaist 22 to 24 in, hip 32 to 34 inXXSXXSwaist 24.5 to 25.5 in, hip 33 to 34.5 inUS numeric 00
XSwaist 24 to 26 in, hip 34 to 36 inXXSXSwaist 24.5 to 25.5 in, hip 33 to 34.5 inUS numeric 00
Swaist 26 to 28 in, hip 36 to 39 inXSnot publishedwaist 25.5 to 27 in, hip 34.5 to 36 inUS numeric 0-2
Mwaist 28 to 30.5 in, hip 39 to 41.5 inMDnot publishedwaist 29 to 31 in, hip 38 to 40 inUS numeric 8-10
Lwaist 30.5 to 33 in, hip 41.5 to 44 inLGnot publishedwaist 31 to 34 in, hip 40 to 43 inUS numeric 12-14
XLwaist 33 to 35.5 in, hip 44 to 46.5 inXLXLwaist 34 to 37 in, hip 43 to 46 inUS numeric 16
XXLwaist 35.5 to 39 in, hip 46.5 to 50 inXXLXXLwaist 37 to 40 in, hip 46 to 49 inUS numeric 18
XXXLwaist 39 to 42.5 in, hip 50 to 53.5 in1X3XLwaist 39 to 43.5 in, hip 47 to 50.5 inUS numeric 16W-18W
4XLwaist 42.5 to 46 in, hip 53.5 to 57 in2Xnot publishedwaist 43.5 to 48.5 in, hip 50.5 to 54.5 inUS numeric 20W-22W
5XLwaist 46 to 49.5 in, hip 57 to 60.5 in2Xnot publishedwaist 43.5 to 48.5 in, hip 50.5 to 54.5 inUS numeric 20W-22W
6XLwaist 49.5 to 53 in, hip 60.5 to 64 in3Xnot publishedwaist 48.5 to 53 in, hip 54.5 to 58 inUS numeric 24W-26W
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

Under Armour to Girlfriend Collective