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Spanx to Zella leggings size

The short answer

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

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 Zella. Letter sizes on the left, Letter on the right.
SpanxSpanx builds it forZella, by chartSame labelZella builds it forZella also prints
XSwaist 25 to 27 in, hip 34 to 36 inXSXSwaist 25 to 26 in, hip 34.5 to 35.5 inUS numeric 0-2
Swaist 27 to 29 in, hip 36 to 38 inSSwaist 27 to 28 in, hip 36.5 to 37.5 inUS numeric 4-6
Mwaist 29 to 31 in, hip 38 to 40 inMMwaist 29 to 30 in, hip 38.5 to 39.5 inUS numeric 8-10
Lwaist 31 to 33.5 in, hip 40 to 42.5 inLLwaist 31.5 to 33.5 in, hip 41.5 to 43.5 inUS numeric 12-14
XLwaist 33.5 to 36 in, hip 42.5 to 45 inXLXLwaist 35.5 in, hip 45.5 inUS numeric 16
1Xwaist 36 to 39 in, hip 45 to 48 inXXLnot publishedwaist 38 in, hip 48.5 inUS numeric 18
2Xwaist 39 to 42 in, hip 48 to 51 in2X2Xwaist 40.5 in, hip 51 inUS numeric 20
3Xwaist 42 to 45 in, hip 51 to 54 in3X3Xwaist 43 to 45 in, hip 53.3 to 55.5 inUS numeric 22-24
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

Zella to Spanx