Natori to Brooks bra size

The short answer

Natori 34D is Brooks L by the two brands' own charts.

The target brand lists the bra sizes each of its sizes covers; rows are read from that list.

Every Natori size read across to Brooks. US sizes on the left, Letter on the right.
Natori	Brooks, by chart	Same label	Brooks also prints
34A	M	not published	not published
34B	M	not published	not published
34C	M	not published	not published
34D	L	not published	not published
34DD	L	not published	not published
34DDD	XL	not published	not published
34G	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. 1 sizes have no counterpart on the Brooks 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

Natori size guide, read on 2026-09-17. Natori on TrueToSize
Brooks size guide, read on 2026-09-18. Brooks on TrueToSize

Brooks to Natori