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Spanx to Lorna Jane leggings size

The short answer

Spanx XS is Lorna Jane XXS by the two brands' own charts. 5 of 6 Spanx sizes land on a different label at Lorna Jane.

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 Lorna Jane. Letter sizes on the left, Letter on the right.
SpanxSpanx builds it forLorna Jane, by chartSame labelLorna Jane builds it forLorna Jane also prints
XSwaist 25 to 27 in, hip 34 to 36 inXXSXSwaist 25.6 in, hip 31.5 inUS numeric 2
Swaist 27 to 29 in, hip 36 to 38 inXSSwaist 27.6 in, hip 35.4 inUS numeric 4
Mwaist 29 to 31 in, hip 38 to 40 inSMwaist 29.5 in, hip 39.4 inUS numeric 6
Lwaist 31 to 33.5 in, hip 40 to 42.5 inM or LLwaist 31.5 in, hip 43.3 inUS numeric 8
XLwaist 33.5 to 36 in, hip 42.5 to 45 inXLXLwaist 35.4 in, hip 51.2 inUS numeric 12
1Xwaist 36 to 39 in, hip 45 to 48 inXXLnot publishedwaist 37.4 in, hip 55.1 inUS numeric 14
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 Lorna Jane 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

Lorna Jane to Spanx