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AYBL to lululemon leggings size

The short answer

AYBL M is lululemon 8 or 10 by the two brands' own charts.

Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.

Every AYBL size read across to lululemon. Letter sizes on the left, US numeric on the right.
AYBLAYBL builds it forlululemon, by chartSame labellululemon builds it forlululemon also prints
XXSwaist 23 to 24 in, hip 33.5 to 35 in2not publishedwaist 23 in, hip 33 inLetter XXS
XSwaist 24 to 26.5 in, hip 35 to 37 in4not publishedwaist 25 in, hip 35 inLetter XS
Swaist 26.5 to 29 in, hip 37 to 39.5 in6 or 8not publishedwaist 27 in, hip 37 inLetter S
Mwaist 29 to 31 in, hip 39.5 to 42 in8 or 10not publishedwaist 29 in, hip 39 inLetter M
Lwaist 31 to 33.5 in, hip 42 to 44.5 in12 or 10not publishedwaist 33 in, hip 43 inLetter XL
XLwaist 33.5 to 36 in, hip 44.5 to 46.5 in14not publishedwaist 35 in, hip 45 inLetter XXL
XXLwaist 36 to 38.5 in, hip 46.5 to 49 in16not publishedwaist 38 in, hip 47 innot published
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

lululemon to AYBL