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Buffbunny to Athleta leggings size

The short answer

Buffbunny XXS/00 is Athleta XXS by the two brands' own charts. 8 of 8 Buffbunny sizes land on a different label at Athleta.

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 Athleta. Letter sizes on the left, Letter on the right.
BuffbunnyBuffbunny builds it forAthleta, by chartSame labelAthleta builds it forAthleta also prints
XXS/00waist 24 to 25 in, hip 33 to 35 inXXSnot publishedwaist 24.3 in, hip 34 inUS numeric 00
XS/0-2waist 25 to 27 in, hip 36 to 37 inXSnot publishedwaist 25.3 to 26.3 in, hip 35 to 36 inUS numeric 0-2
S/4-6waist 27 to 28 in, hip 38 to 39 inSnot publishedwaist 27.3 to 28.3 in, hip 37 to 38 inUS numeric 4-6
M/6-8waist 29 to 31 in, hip 39 to 41 inMnot publishedwaist 29.3 to 30.3 in, hip 39 to 40 inUS numeric 8-10
L/10-12waist 32 to 34 in, hip 42 to 44 inLnot publishedwaist 31.8 to 33.3 in, hip 41.5 to 43 inUS numeric 12-14
XL/14-16waist 35 to 37 in, hip 45 to 47 inXL or 1Xnot publishedwaist 34.3 in, hip 44.5 inUS numeric 16-18
XXL/16-18waist 37 to 39 in, hip 47 to 49 in1Xnot publishedwaist 38 to 40 in, hip 47.3 to 49.3 inUS numeric 16W-18W
XXXL/18-20waist 39 to 41 in, hip 50 to 52 in1Xnot publishedwaist 38 to 40 in, hip 47.3 to 49.3 inUS numeric 16W-18W
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

Athleta to Buffbunny