Harper Wilde to Triumph bra size

The short answer

Harper Wilde 34D is Triumph 75D by the two brands' own charts.

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

Every Harper Wilde size read across to Triumph. US sizes on the left, EU on the right.
Harper Wilde	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

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.

Open in the converter Add an item you own

Sources

Harper Wilde size guide, read on 2026-09-18. Harper Wilde on TrueToSize
Triumph size guide, read on 2026-09-18.

Triumph to Harper Wilde