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Alphalete to Sweaty Betty leggings size

The short answer

Alphalete 2XS is Sweaty Betty XXS by the two brands' own charts. 2 of 7 Alphalete 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 Alphalete size read across to Sweaty Betty. Letter sizes on the left, Letter on the right.
AlphaleteAlphalete builds it forSweaty Betty, by chartSame labelSweaty Betty builds it forSweaty Betty also prints
2XSwaist 23 to 24 in, hip 33 to 34 inXXSXXSwaist 23 in, hip 34 inUS numeric 2
XSwaist 25 to 26 in, hip 35 to 36 inXSXSwaist 25 in, hip 36 inUS numeric 4
Swaist 27 to 28 in, hip 37 to 38 inSSwaist 27 in, hip 38 inUS numeric 6
Mwaist 29 to 30 in, hip 39 to 40 inMMwaist 29 in, hip 40 inUS numeric 8
Lwaist 31 to 32 in, hip 41 to 42 inLLwaist 31 in, hip 42 inUS numeric 10
XLwaist 33 to 34 in, hip 43 to 44 inXLXLwaist 33 in, hip 44 inUS numeric 12
2XLwaist 35 to 36 in, hip 45 to 46 inXXLXXLwaist 36 in, hip 46.5 inUS numeric 14
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 Alphalete