Wacoal to Triumph bra size

The short answer

Wacoal 34DDD is Triumph 75F by the two brands' own charts.

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

Every Wacoal size read across to Triumph. US sizes on the left, EU on the right.
Wacoal	Triumph, by chart	Same label	Triumph also prints
34A	75A	not published	UK A · US A · FR A · AU A
34B	75B	not published	UK B · US B · FR B · AU B
34C	75C	not published	UK C · US C · FR C · AU C
34D	75D	not published	UK D · US D · FR D · AU D
34DD	75E	not published	UK DD · US DD · FR E · AU DD
34DDD	75F	not published	UK E · US DDD · FR F · AU E
34G	75G	not published	UK F · US G · FR G · AU F
34H	75H	not published	UK G · US H · FR H · AU G
34I	75I	not published	UK H · US I · FR I · AU H
34J	75J	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. 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

Wacoal size guide, read on 2026-09-17. Wacoal on TrueToSize
Triumph size guide, read on 2026-09-18.

Triumph to Wacoal