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Sweaty Betty to lululemon leggings size

The short answer

Sweaty Betty M is lululemon 8 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 Sweaty Betty size read across to lululemon. Letter sizes on the left, US numeric on the right.
Sweaty BettySweaty Betty builds it forlululemon, by chartSame labellululemon builds it forlululemon also prints
XXSwaist 23 in, hip 34 in22waist 23 in, hip 33 inLetter XXS
XSwaist 25 in, hip 36 in44waist 25 in, hip 35 inLetter XS
Swaist 27 in, hip 38 in66waist 27 in, hip 37 inLetter S
Mwaist 29 in, hip 40 in88waist 29 in, hip 39 inLetter M
Lwaist 31 in, hip 42 in1010waist 31 in, hip 41 inLetter L
XLwaist 33 in, hip 44 in1212waist 33 in, hip 43 inLetter XL
XXLwaist 36 in, hip 46.5 in1414waist 35 in, hip 45 inLetter XXL
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 Sweaty Betty