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Buffbunny to Old Navy leggings size

The short answer

Buffbunny XXS/00 is Old Navy XXS by the two brands' own charts. 8 of 8 Buffbunny 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 Buffbunny size read across to Old Navy. Letter sizes on the left, Letter on the right.
BuffbunnyBuffbunny builds it forOld Navy, by chartSame labelOld Navy builds it forOld Navy also prints
XXS/00waist 24 to 25 in, hip 33 to 35 inXXSnot publishedwaist 24 in, hip 34.5 inUS numeric 00
XS/0-2waist 25 to 27 in, hip 36 to 37 inXSnot publishedwaist 25 to 26 in, hip 35.5 to 36.5 inUS numeric 0-2
S/4-6waist 27 to 28 in, hip 38 to 39 inSnot publishedwaist 27 to 28 in, hip 37.5 to 38.5 inUS numeric 4-6
M/6-8waist 29 to 31 in, hip 39 to 41 inMnot publishedwaist 29 to 30 in, hip 39.5 to 40.5 inUS numeric 8-10
L/10-12waist 32 to 34 in, hip 42 to 44 inLnot publishedwaist 31.5 to 33.5 in, hip 42 to 44 inUS numeric 12-14
XL/14-16waist 35 to 37 in, hip 45 to 47 inXLnot publishedwaist 36.3 to 39 in, hip 46.5 to 49 inUS numeric 16-18
XXL/16-18waist 37 to 39 in, hip 47 to 49 inXLnot publishedwaist 36.3 to 39 in, hip 46.5 to 49 inUS numeric 16-18
XXXL/18-20waist 39 to 41 in, hip 50 to 52 inXL or XXLnot publishedwaist 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 Buffbunny