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Girlfriend Collective to Gymshark leggings size

The short answer

Girlfriend Collective XS is Gymshark XXS or XS by the two brands' own charts. 2 of 7 Girlfriend Collective sizes land on a different label at Gymshark.

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 Gymshark. Letter sizes on the left, Letter on the right.
Girlfriend CollectiveGirlfriend Collective builds it forGymshark, by chartSame labelGymshark builds it forGymshark also prints
XXSwaist 22 to 24 in, hip 32 to 34 inXXSXXSwaist 24 in, hip 35.5 inUS numeric 2-4
XSwaist 24 to 26 in, hip 34 to 36 inXXS or XSXSwaist 24 in, hip 35.5 inUS numeric 2-4
Swaist 26 to 28 in, hip 36 to 39 inXS or SSwaist 26 in, hip 37.5 inUS numeric 4-6
Mwaist 28 to 30.5 in, hip 39 to 41.5 inM or SMwaist 30 in, hip 41.5 inUS numeric 8-10
Lwaist 30.5 to 33 in, hip 41.5 to 44 inLLwaist 32 in, hip 43.5 inUS numeric 10-12
XLwaist 33 to 35.5 in, hip 44 to 46.5 inXLXLwaist 34 in, hip 45.5 inUS numeric 12-14
XXLwaist 35.5 to 39 in, hip 46.5 to 50 inXXLXXLwaist 36 in, hip 47.7 inUS numeric 14-16
XXXLwaist 39 to 42.5 in, hip 50 to 53.5 innot madenot publishednot publishednot published
4XLwaist 42.5 to 46 in, hip 53.5 to 57 innot madenot publishednot publishednot published
5XLwaist 46 to 49.5 in, hip 57 to 60.5 innot madenot publishednot publishednot published
6XLwaist 49.5 to 53 in, hip 60.5 to 64 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 4 sizes have no counterpart on the Gymshark 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

Gymshark to Girlfriend Collective