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Oysho to Sweaty Betty leggings size

The short answer

Oysho XXS is Sweaty Betty XS by the two brands' own charts. 2 of 7 Oysho 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 Oysho size read across to Sweaty Betty. Letter sizes on the left, Letter on the right.
OyshoOysho builds it forSweaty Betty, by chartSame labelSweaty Betty builds it forSweaty Betty also prints
XXSwaist 24 to 25 in, hip 36 to 37 inXSXXSwaist 25 in, hip 36 inUS numeric 4
XSwaist 25 to 26 in, hip 37 to 38 inXSXSwaist 25 in, hip 36 inUS numeric 4
Swaist 26 to 27 in, hip 38 to 39 inSSwaist 27 in, hip 38 inUS numeric 6
Mwaist 27 to 29 in, hip 39 to 41 inS or MMwaist 27 in, hip 38 inUS numeric 6
Lwaist 30 to 33 in, hip 42 to 45 inLLwaist 31 in, hip 42 inUS numeric 10
XLwaist 33 to 35 in, hip 45 to 47 inXLXLwaist 33 in, hip 44 inUS numeric 12
XXLwaist 36 to 39 in, hip 48 to 51 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 Oysho