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Girlfriend Collective to Aerie (OFFLINE) leggings size

The short answer

Girlfriend Collective XXXL is Aerie (OFFLINE) XXL by the two brands' own charts. 1 of 8 Girlfriend Collective sizes land on a different label at Aerie (OFFLINE).

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 Aerie (OFFLINE). Letter sizes on the left, Letter on the right.
Girlfriend CollectiveGirlfriend Collective builds it forAerie (OFFLINE), by chartSame labelAerie (OFFLINE) builds it forAerie (OFFLINE) also prints
XXSwaist 22 to 24 in, hip 32 to 34 inXXSXXSwaist 22.5 to 23.5 in, hip 32 to 33 inUS numeric 000-00
XSwaist 24 to 26 in, hip 34 to 36 inXSXSwaist 24.5 to 25.5 in, hip 34 to 35 inUS numeric 0-2
Swaist 26 to 28 in, hip 36 to 39 inSSwaist 26.5 to 27.5 in, hip 36 to 37 inUS numeric 4-6
Mwaist 28 to 30.5 in, hip 39 to 41.5 inMMwaist 28.5 to 29.5 in, hip 38 to 39 inUS numeric 8-10
Lwaist 30.5 to 33 in, hip 41.5 to 44 inLLwaist 31 to 32.5 in, hip 40.5 to 42 inUS numeric 12-14
XLwaist 33 to 35.5 in, hip 44 to 46.5 inXLXLwaist 34 to 36 in, hip 43.5 to 45.5 inUS numeric 16-18
XXLwaist 35.5 to 39 in, hip 46.5 to 50 inXXLXXLwaist 38 in, hip 47.5 inUS numeric 20
XXXLwaist 39 to 42.5 in, hip 50 to 53.5 inXXLnot publishedwaist 38 in, hip 47.5 inUS numeric 20
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 Aerie (OFFLINE) 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

Aerie (OFFLINE) to Girlfriend Collective