Bras N Things to lululemon bra size

The short answer

Bras N Things 12F is lululemon 34G by the two brands' own charts.

Cups are counted along each brand's own letter order, and the band is carried across unchanged.

Every Bras N Things size read across to lululemon. AU sizes on the left, US on the right.
Bras N Things	lululemon, by chart	Same label	lululemon also prints
12A	not made	not published	not published
12B	34B	not published	not published
12C	34C	not published	not published
12D	34D	not published	not published
12DD	34DD	not published	not published
12E	34DDD	not published	not published
12F	34G	not published	not published
12G	not made	not published	not published

Neither chart publishes the body each size is built for, so the rows line up the labels. Tinted rows change label or sit between two sizes. 2 sizes have no counterpart on the lululemon 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

Bras N Things size guide, read on 2026-09-18.
lululemon size guide, read on 2026-09-18. lululemon on TrueToSize

lululemon to Bras N Things