Bras N Things to Triumph bra size

The short answer

Bras N Things 12DD is Triumph 75E 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 Triumph. AU sizes on the left, EU on the right.
Bras N Things	Triumph, by chart	Same label	Triumph also prints
12A	75A	not published	UK A · US A · FR A · AU A
12B	75B	not published	UK B · US B · FR B · AU B
12C	75C	not published	UK C · US C · FR C · AU C
12D	75D	not published	UK D · US D · FR D · AU D
12DD	75E	not published	UK DD · US DD · FR E · AU DD
12E	75F	not published	UK E · US DDD · FR F · AU E
12F	75G	not published	UK F · US G · FR G · AU F
12G	75H	not published	UK G · US H · FR H · AU G

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

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

Triumph to Bras N Things