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Girlfriend Collective to Spanx leggings size

The short answer

Girlfriend Collective XXS is Spanx XS by the two brands' own charts. 6 of 10 Girlfriend Collective sizes land on a different label at Spanx.

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 Spanx. Letter sizes on the left, Letter on the right.
Girlfriend CollectiveGirlfriend Collective builds it forSpanx, by chartSame labelSpanx builds it forSpanx also prints
XXSwaist 22 to 24 in, hip 32 to 34 inXSnot publishedwaist 25 to 27 in, hip 34 to 36 inUS numeric 0-2
XSwaist 24 to 26 in, hip 34 to 36 inXSXSwaist 25 to 27 in, hip 34 to 36 inUS numeric 0-2
Swaist 26 to 28 in, hip 36 to 39 inXSSwaist 25 to 27 in, hip 34 to 36 inUS numeric 0-2
Mwaist 28 to 30.5 in, hip 39 to 41.5 inMMwaist 29 to 31 in, hip 38 to 40 inUS numeric 8-10
Lwaist 30.5 to 33 in, hip 41.5 to 44 inLLwaist 31 to 33.5 in, hip 40 to 42.5 inUS numeric 12-14
XLwaist 33 to 35.5 in, hip 44 to 46.5 inXLXLwaist 33.5 to 36 in, hip 42.5 to 45 inUS numeric 16
XXLwaist 35.5 to 39 in, hip 46.5 to 50 in1Xnot publishedwaist 36 to 39 in, hip 45 to 48 inUS numeric 18-20
XXXLwaist 39 to 42.5 in, hip 50 to 53.5 in2Xnot publishedwaist 39 to 42 in, hip 48 to 51 inUS numeric 22-24
4XLwaist 42.5 to 46 in, hip 53.5 to 57 in3Xnot publishedwaist 42 to 45 in, hip 51 to 54 inUS numeric 26
5XLwaist 46 to 49.5 in, hip 57 to 60.5 in3Xnot publishedwaist 42 to 45 in, hip 51 to 54 inUS numeric 26
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. 1 sizes have no counterpart on the Spanx 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

Spanx to Girlfriend Collective