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Spanx to Athleta leggings size

The short answer

Spanx 2X is Athleta 1X or 2X by the two brands' own charts. 2 of 8 Spanx sizes land on a different label at Athleta.

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 Athleta. Letter sizes on the left, Letter on the right.
SpanxSpanx builds it forAthleta, by chartSame labelAthleta builds it forAthleta also prints
XSwaist 25 to 27 in, hip 34 to 36 inXSXSwaist 25.3 to 26.3 in, hip 35 to 36 inUS numeric 0-2
Swaist 27 to 29 in, hip 36 to 38 inSSwaist 27.3 to 28.3 in, hip 37 to 38 inUS numeric 4-6
Mwaist 29 to 31 in, hip 38 to 40 inMMwaist 29.3 to 30.3 in, hip 39 to 40 inUS numeric 8-10
Lwaist 31 to 33.5 in, hip 40 to 42.5 inLLwaist 31.8 to 33.3 in, hip 41.5 to 43 inUS numeric 12-14
XLwaist 33.5 to 36 in, hip 42.5 to 45 inXLXLwaist 34.3 in, hip 44.5 inUS numeric 16-18
1Xwaist 36 to 39 in, hip 45 to 48 in1X1Xwaist 38 to 40 in, hip 47.3 to 49.3 inUS numeric 16W-18W
2Xwaist 39 to 42 in, hip 48 to 51 in1X or 2X2Xwaist 38 to 40 in, hip 47.3 to 49.3 inUS numeric 16W-18W
3Xwaist 42 to 45 in, hip 51 to 54 in2X3Xwaist 42 to 44.5 in, hip 51.3 to 53.8 inUS numeric 20W-22W
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

Athleta to Spanx