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Girlfriend Collective to Decathlon leggings size

The short answer

Girlfriend Collective XXS is Decathlon 2XS by the two brands' own charts. 4 of 8 Girlfriend Collective sizes land on a different label at Decathlon.

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 Decathlon. Letter sizes on the left, Letter on the right.
Girlfriend CollectiveGirlfriend Collective builds it forDecathlon, by chartSame labelDecathlon builds it forDecathlon also prints
XXSwaist 22 to 24 in, hip 32 to 34 in2XS2XSwaist 23.6 to 24.8 in, hip 31.1 to 33.5 innot published
XSwaist 24 to 26 in, hip 34 to 36 in2XSXSwaist 23.6 to 24.8 in, hip 31.1 to 33.5 innot published
Swaist 26 to 28 in, hip 36 to 39 inSSwaist 27.2 to 28.7 in, hip 35.4 to 37.8 innot published
Mwaist 28 to 30.5 in, hip 39 to 41.5 inMMwaist 29.1 to 31.1 in, hip 37.8 to 40.2 innot published
Lwaist 30.5 to 33 in, hip 41.5 to 44 inLLwaist 31.5 to 33.9 in, hip 40.2 to 42.5 innot published
XLwaist 33 to 35.5 in, hip 44 to 46.5 inXLXLwaist 34.3 to 36.6 in, hip 42.5 to 44.9 innot published
XXLwaist 35.5 to 39 in, hip 46.5 to 50 in2XL2XLwaist 37 to 39.4 in, hip 44.9 to 47.2 innot published
XXXLwaist 39 to 42.5 in, hip 50 to 53.5 in2XLnot publishedwaist 37 to 39.4 in, hip 44.9 to 47.2 innot 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. 3 sizes have no counterpart on the Decathlon 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

Decathlon to Girlfriend Collective