Bras N Things to PrimaDonna bra size

The short answer

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

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

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

PrimaDonna to Bras N Things