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Girlfriend Collective to Onzie leggings size

The short answer

Girlfriend Collective XXS is Onzie X/S by the two brands' own charts. 7 of 8 Girlfriend Collective sizes land on a different label at Onzie.

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 Onzie. Letter sizes on the left, Letter on the right.
Girlfriend CollectiveGirlfriend Collective builds it forOnzie, by chartSame labelOnzie builds it forOnzie also prints
XXSwaist 22 to 24 in, hip 32 to 34 inX/Snot publishedwaist 24 to 26 in, hip 33 to 35 inUS numeric 0-2
XSwaist 24 to 26 in, hip 34 to 36 inX/Snot publishedwaist 24 to 26 in, hip 33 to 35 inUS numeric 0-2
Swaist 26 to 28 in, hip 36 to 39 inS/MX/Swaist 26 to 28 in, hip 36 to 38 inUS numeric 2-6
Mwaist 28 to 30.5 in, hip 39 to 41.5 inM/LS/Mwaist 28 to 31 in, hip 38 to 40 inUS numeric 6-8
Lwaist 30.5 to 33 in, hip 41.5 to 44 inL/LM/Lwaist 31 to 33 in, hip 40 to 42 inUS numeric 10-12
XLwaist 33 to 35.5 in, hip 44 to 46.5 inXLXLwaist 34 to 37 in, hip 43 to 45 inUS numeric 14-16
XXLwaist 35.5 to 39 in, hip 46.5 to 50 inXLnot publishedwaist 34 to 37 in, hip 43 to 45 inUS numeric 14-16
XXXLwaist 39 to 42.5 in, hip 50 to 53.5 in1Xnot publishedwaist 38 to 40 in, hip 46 to 48 inUS numeric 16-18
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 Onzie 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

Onzie to Girlfriend Collective