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Oysho to Nike leggings size

The short answer

Oysho XXS is Nike XS by the two brands' own charts. 5 of 7 Oysho sizes land on a different label at Nike.

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 Nike. Letter sizes on the left, Letter on the right.
OyshoOysho builds it forNike, by chartSame labelNike builds it forNike also prints
XXSwaist 24 to 25 in, hip 36 to 37 inXSXXSwaist 23.5 to 26 in, hip 33 to 35.5 inUS numeric 0-2
XSwaist 25 to 26 in, hip 37 to 38 inXSXSwaist 23.5 to 26 in, hip 33 to 35.5 inUS numeric 0-2
Swaist 26 to 27 in, hip 38 to 39 inSSwaist 26 to 29 in, hip 35.5 to 38.5 inUS numeric 4-6
Mwaist 27 to 29 in, hip 39 to 41 inSMwaist 26 to 29 in, hip 35.5 to 38.5 inUS numeric 4-6
Lwaist 30 to 33 in, hip 42 to 45 inMLwaist 29 to 31.5 in, hip 38.5 to 41 inUS numeric 8-10
XLwaist 33 to 35 in, hip 45 to 47 inLXLwaist 31.5 to 34.5 in, hip 41 to 44 inUS numeric 12-14
XXLwaist 36 to 39 in, hip 48 to 51 inXLXXLwaist 34.5 to 38.5 in, hip 44 to 47 inUS numeric 16-18
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

Nike to Oysho