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Tracksmith to Spanx leggings size

The short answer

Tracksmith S is Spanx XS by the two brands' own charts. 5 of 6 Tracksmith 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 Tracksmith Women's Strata Short Tights size read across to Spanx. Letter sizes on the left, Letter on the right.
Tracksmith Women's Strata Short TightsTracksmith builds it forSpanx, by chartSame labelSpanx builds it forSpanx also prints
XSwaist 23 to 25 in, hip 32 to 34 inXSXSwaist 25 to 27 in, hip 34 to 36 inUS numeric 0-2
Swaist 25 to 27 in, hip 34 to 36 inXSSwaist 25 to 27 in, hip 34 to 36 inUS numeric 0-2
Mwaist 27 to 29 in, hip 36 to 38 inSMwaist 27 to 29 in, hip 36 to 38 inUS numeric 4-6
Lwaist 29 to 31 in, hip 38 to 40 inMLwaist 29 to 31 in, hip 38 to 40 inUS numeric 8-10
XLwaist 31 to 33 in, hip 40 to 42 inLXLwaist 31 to 33.5 in, hip 40 to 42.5 inUS numeric 12-14
XXLwaist 33 to 35 in, hip 42 to 44 inXLnot publishedwaist 33.5 to 36 in, hip 42.5 to 45 inUS numeric 16
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

Spanx to Tracksmith