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Lululemon to Fabletics leggings size

The short answer

lululemon 4 is Fabletics XXS 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 lululemon size read across to Fabletics. US numeric sizes on the left, Letter on the right.
lululemonlululemon builds it forFabletics, by chartSame labelFabletics builds it forFabletics also prints
0waist 21 in, hip 32 innot madenot publishednot publishednot published
2waist 23 in, hip 33 innot madeXXSnot publishednot published
4waist 25 in, hip 35 inXXSXSwaist 24 to 25 in, hip 33 to 35 inUS numeric 00
6waist 27 in, hip 37 inSSwaist 27 to 28 in, hip 37.5 to 38.5 inUS numeric 4-6
8waist 29 in, hip 39 inMMwaist 29 to 31 in, hip 39 to 41 inUS numeric 8-10
10waist 31 in, hip 41 inMLwaist 29 to 31 in, hip 39 to 41 inUS numeric 8-10
12waist 33 in, hip 43 inLXLwaist 32 to 34 in, hip 42 to 44 inUS numeric 12-14
14waist 35 in, hip 45 inXLXXL/1Xwaist 35 to 37 in, hip 45 to 47 inUS numeric 16-18
16waist 38 in, hip 47 inXXL/1Xnot publishedwaist 38 to 41 in, hip 48 to 51 inUS numeric 16-18
18waist 41 in, hip 49 in2Xnot publishedwaist 41 to 43 in, hip 51 to 53 inUS numeric 20-22
20waist 43 in, hip 51 in2Xnot publishedwaist 41 to 43 in, hip 51 to 53 inUS numeric 20-22
Tinted rows change label or sit between two sizes. 2 sizes have no counterpart on the Fabletics chart. 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

Fabletics to lululemon