Harper Wilde to PrimaDonna bra size

The short answer

Harper Wilde 34D is PrimaDonna 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 PrimaDonna. US sizes on the left, EU on the right.
Harper Wilde	PrimaDonna, by chart	Same label	PrimaDonna also prints
34A	not made	not published	not published
34B	75B	not published	UK B · US B
34C	75C	not published	UK C · US C
34D	75D	not published	UK D · US D
34DD	75E	not published	UK E · US DD
34DDD	75F	not published	UK F · US DDD

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 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

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

PrimaDonna to Harper Wilde