Triumph to PrimaDonna bra size

The short answer

Triumph 75F is PrimaDonna 75F by the two brands' own charts. 0 of 9 Triumph sizes land on a different label at PrimaDonna.

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

Every Triumph size read across to PrimaDonna. EU sizes on the left, EU on the right.
Triumph	Triumph builds it for	PrimaDonna, by chart	Same label	PrimaDonna builds it for	PrimaDonna also prints
75AA	not published	not made	not published	not published	not published
75A	not published	not made	not published	not published	not published
75B	not published	75B	not published	not published	UK B · US B
75C	not published	75C	not published	not published	UK C · US C
75D	not published	75D	not published	not published	UK D · US D
75E	not published	75E	not published	not published	UK E · US DD
75F	not published	75F	not published	not published	UK F · US DDD
75G	not published	75G	not published	not published	UK G · US G
75H	not published	75H	not published	not published	UK H · US H
75I	not published	75I	not published	not published	UK I · US I
75J	not published	75J	not published	not published	UK J · US J

Tinted rows change label or sit between two sizes. 2 sizes have no counterpart on the PrimaDonna 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

Triumph size guide, read on 2026-09-18.
PrimaDonna size guide, read on 2026-09-18.

PrimaDonna to Triumph