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Tracksmith to Sweaty Betty leggings size

The short answer

Tracksmith XS is Sweaty Betty XXS or XS by the two brands' own charts. 6 of 6 Tracksmith sizes land on a different label at Sweaty Betty.

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 Sweaty Betty. Letter sizes on the left, Letter on the right.
Tracksmith Women's Strata Short TightsTracksmith builds it forSweaty Betty, by chartSame labelSweaty Betty builds it forSweaty Betty also prints
XSwaist 23 to 25 in, hip 32 to 34 inXXS or XSXSwaist 23 in, hip 34 inUS numeric 2
Swaist 25 to 27 in, hip 34 to 36 inXS or SSwaist 25 in, hip 36 inUS numeric 4
Mwaist 27 to 29 in, hip 36 to 38 inS or MMwaist 27 in, hip 38 inUS numeric 6
Lwaist 29 to 31 in, hip 38 to 40 inM or LLwaist 29 in, hip 40 inUS numeric 8
XLwaist 31 to 33 in, hip 40 to 42 inL or XLXLwaist 31 in, hip 42 inUS numeric 10
XXLwaist 33 to 35 in, hip 42 to 44 inXLXXLwaist 33 in, hip 44 inUS numeric 12
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

Sweaty Betty to Tracksmith