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Girlfriend Collective to SET Active leggings size

The short answer

Girlfriend Collective XXS is SET Active XS by the two brands' own charts. 3 of 8 Girlfriend Collective sizes land on a different label at SET Active.

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 SET Active. Letter sizes on the left, Letter on the right.
Girlfriend CollectiveGirlfriend Collective builds it forSET Active, by chartSame labelSET Active builds it forSET Active also prints
XXSwaist 22 to 24 in, hip 32 to 34 inXSnot publishedwaist 22 to 24 inUS numeric 00-4
XSwaist 24 to 26 in, hip 34 to 36 inSXSwaist 25 to 27 inUS numeric 4-6
Swaist 26 to 28 in, hip 36 to 39 inSSwaist 25 to 27 inUS numeric 4-6
Mwaist 28 to 30.5 in, hip 39 to 41.5 inMMwaist 28 to 30 inUS numeric 8-10
Lwaist 30.5 to 33 in, hip 41.5 to 44 inLLwaist 31 to 33 inUS numeric 12-14
XLwaist 33 to 35.5 in, hip 44 to 46.5 inXLXLwaist 34 to 36 inUS numeric 16-18
XXLwaist 35.5 to 39 in, hip 46.5 to 50 inXXLXXLwaist 37 to 40 inUS numeric 20-22
XXXLwaist 39 to 42.5 in, hip 50 to 53.5 inXXLnot publishedwaist 37 to 40 inUS numeric 20-22
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 SET Active 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

SET Active to Girlfriend Collective