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Beyond Yoga to Spanx leggings size

The short answer

Beyond Yoga XXS is Spanx XS by the two brands' own charts. 4 of 9 Beyond Yoga 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 Beyond Yoga size read across to Spanx. Letter sizes on the left, Letter on the right.
Beyond YogaBeyond Yoga builds it forSpanx, by chartSame labelSpanx builds it forSpanx also prints
XXSwaist 25 inXSnot publishedwaist 25 to 27 in, hip 34 to 36 inUS numeric 0-2
XSwaist 26 to 27.5 in, hip 35.5 to 37 inXSXSwaist 25 to 27 in, hip 34 to 36 inUS numeric 0-2
Swaist 28 to 29.5 in, hip 37.5 to 39 inSSwaist 27 to 29 in, hip 36 to 38 inUS numeric 4-6
Mwaist 30 to 31.5 in, hip 39.5 to 41 inMMwaist 29 to 31 in, hip 38 to 40 inUS numeric 8-10
Lwaist 32 to 33.5 in, hip 41.5 to 43 inLLwaist 31 to 33.5 in, hip 40 to 42.5 inUS numeric 12-14
XLwaist 34 to 35.5 in, hip 43.5 to 45 inXLXLwaist 33.5 to 36 in, hip 42.5 to 45 inUS numeric 16
XXLwaist 36 to 39.5 in1Xnot publishedwaist 36 to 39 in, hip 45 to 48 inUS numeric 18-20
1Xwaist 41 to 43 in, hip 50 to 52 in2X1Xwaist 39 to 42 in, hip 48 to 51 inUS numeric 22-24
2Xwaist 44 to 47 in, hip 53 to 56 in3X2Xwaist 42 to 45 in, hip 51 to 54 inUS numeric 26
3Xwaist 48 to 51 innot made3Xnot publishednot published
4Xwaist 52 to 56 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 2 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 Beyond Yoga