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Oysho to Under Armour leggings size

The short answer

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

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 Under Armour. Letter sizes on the left, Letter on the right.
OyshoOysho builds it forUnder Armour, by chartSame labelUnder Armour builds it forUnder Armour also prints
XXSwaist 24 to 25 in, hip 36 to 37 inXXSXXSwaist 24.5 to 25.5 in, hip 33 to 34.5 inUS numeric 00
XSwaist 25 to 26 in, hip 37 to 38 inXXSXSwaist 24.5 to 25.5 in, hip 33 to 34.5 inUS numeric 00
Swaist 26 to 27 in, hip 38 to 39 inXSnot publishedwaist 25.5 to 27 in, hip 34.5 to 36 inUS numeric 0-2
Mwaist 27 to 29 in, hip 39 to 41 inSMnot publishedwaist 27 to 29 in, hip 36 to 38 inUS numeric 4-6
Lwaist 30 to 33 in, hip 42 to 45 inLGnot publishedwaist 31 to 34 in, hip 40 to 43 inUS numeric 12-14
XLwaist 33 to 35 in, hip 45 to 47 inLGXLwaist 31 to 34 in, hip 40 to 43 inUS numeric 12-14
XXLwaist 36 to 39 in, hip 48 to 51 inXXLXXLwaist 37 to 40 in, hip 46 to 49 inUS numeric 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

Under Armour to Oysho