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Spanx to Alphalete leggings size

The short answer

Spanx XL is Alphalete 2XL by the two brands' own charts. 2 of 6 Spanx sizes land on a different label at Alphalete.

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 Alphalete. Letter sizes on the left, Letter on the right.
SpanxSpanx builds it forAlphalete, by chartSame labelAlphalete builds it forAlphalete also prints
XSwaist 25 to 27 in, hip 34 to 36 inXSXSwaist 25 to 26 in, hip 35 to 36 innot published
Swaist 27 to 29 in, hip 36 to 38 inSSwaist 27 to 28 in, hip 37 to 38 innot published
Mwaist 29 to 31 in, hip 38 to 40 inMMwaist 29 to 30 in, hip 39 to 40 innot published
Lwaist 31 to 33.5 in, hip 40 to 42.5 inLLwaist 31 to 32 in, hip 41 to 42 innot published
XLwaist 33.5 to 36 in, hip 42.5 to 45 in2XLXLwaist 35 to 36 in, hip 45 to 46 innot published
1Xwaist 36 to 39 in, hip 45 to 48 in2XLnot publishedwaist 35 to 36 in, hip 45 to 46 innot published
2Xwaist 39 to 42 in, hip 48 to 51 innot madenot publishednot publishednot published
3Xwaist 42 to 45 in, hip 51 to 54 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 2 sizes have no counterpart on the Alphalete 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

Alphalete to Spanx