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Oysho to Old Navy leggings size

The short answer

Oysho S is Old Navy XS or S by the two brands' own charts. 4 of 7 Oysho sizes land on a different label at Old Navy.

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 Old Navy. Letter sizes on the left, Letter on the right.
OyshoOysho builds it forOld Navy, by chartSame labelOld Navy builds it forOld Navy also prints
XXSwaist 24 to 25 in, hip 36 to 37 inXXSXXSwaist 24 in, hip 34.5 inUS numeric 00
XSwaist 25 to 26 in, hip 37 to 38 inXSXSwaist 25 to 26 in, hip 35.5 to 36.5 inUS numeric 0-2
Swaist 26 to 27 in, hip 38 to 39 inXS or SSwaist 25 to 26 in, hip 35.5 to 36.5 inUS numeric 0-2
Mwaist 27 to 29 in, hip 39 to 41 inSMwaist 27 to 28 in, hip 37.5 to 38.5 inUS numeric 4-6
Lwaist 30 to 33 in, hip 42 to 45 inLLwaist 31.5 to 33.5 in, hip 42 to 44 inUS numeric 12-14
XLwaist 33 to 35 in, hip 45 to 47 inLXLwaist 31.5 to 33.5 in, hip 42 to 44 inUS numeric 12-14
XXLwaist 36 to 39 in, hip 48 to 51 inXLXXLwaist 36.3 to 39 in, hip 46.5 to 49 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

Old Navy to Oysho