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Athleta to Spanx leggings size

The short answer

Athleta XXS is Spanx XS by the two brands' own charts. 2 of 8 Athleta 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 Athleta size read across to Spanx. Letter sizes on the left, Letter on the right.
AthletaAthleta builds it forSpanx, by chartSame labelSpanx builds it forSpanx also prints
XXSwaist 24.3 in, hip 34 inXSnot publishedwaist 25 to 27 in, hip 34 to 36 inUS numeric 0-2
XSwaist 25.3 to 26.3 in, hip 35 to 36 inXSXSwaist 25 to 27 in, hip 34 to 36 inUS numeric 0-2
Swaist 27.3 to 28.3 in, hip 37 to 38 inSSwaist 27 to 29 in, hip 36 to 38 inUS numeric 4-6
Mwaist 29.3 to 30.3 in, hip 39 to 40 inMMwaist 29 to 31 in, hip 38 to 40 inUS numeric 8-10
Lwaist 31.8 to 33.3 in, hip 41.5 to 43 inLLwaist 31 to 33.5 in, hip 40 to 42.5 inUS numeric 12-14
XLwaist 34.3 in, hip 44.5 inXLXLwaist 33.5 to 36 in, hip 42.5 to 45 inUS numeric 16
1Xwaist 38 to 40 in, hip 47.3 to 49.3 in1X1Xwaist 36 to 39 in, hip 45 to 48 inUS numeric 18-20
2Xwaist 42 to 44.5 in, hip 51.3 to 53.8 in3X2Xwaist 42 to 45 in, hip 51 to 54 inUS numeric 26
3Xwaist 47 to 49.5 in, hip 56.3 to 58.8 innot made3Xnot 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 Athleta