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Spanx to Girlfriend Collective leggings size

The short answer

Spanx 1X is Girlfriend Collective XXL by the two brands' own charts. 3 of 8 Spanx sizes land on a different label at Girlfriend Collective.

Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.

Every Spanx size read across to Girlfriend Collective. Letter sizes on the left, Letter on the right.
SpanxSpanx builds it forGirlfriend Collective, by chartSame labelGirlfriend Collective builds it forGirlfriend Collective also prints
XSwaist 25 to 27 in, hip 34 to 36 inXSXSwaist 24 to 26 in, hip 34 to 36 innot published
Swaist 27 to 29 in, hip 36 to 38 inSSwaist 26 to 28 in, hip 36 to 39 innot published
Mwaist 29 to 31 in, hip 38 to 40 inMMwaist 28 to 30.5 in, hip 39 to 41.5 innot published
Lwaist 31 to 33.5 in, hip 40 to 42.5 inLLwaist 30.5 to 33 in, hip 41.5 to 44 innot published
XLwaist 33.5 to 36 in, hip 42.5 to 45 inXLXLwaist 33 to 35.5 in, hip 44 to 46.5 innot published
1Xwaist 36 to 39 in, hip 45 to 48 inXXLnot publishedwaist 35.5 to 39 in, hip 46.5 to 50 innot published
2Xwaist 39 to 42 in, hip 48 to 51 inXXXLnot publishedwaist 39 to 42.5 in, hip 50 to 53.5 innot published
3Xwaist 42 to 45 in, hip 51 to 54 in4XLnot publishedwaist 42.5 to 46 in, hip 53.5 to 57 innot published
Tinted rows change label or sit between two sizes. 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

Girlfriend Collective to Spanx