Marks & Spencer to Panache bra size

The short answer

Marks & Spencer 34F is Panache 34G by the two brands' own charts.

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

Every Marks & Spencer size read across to Panache. UK sizes on the left, US on the right.
Marks & Spencer	Panache, by chart	Same label	Panache also prints
34AA	not made	not published	not published
34A	not made	not published	not published
34B	34B	not published	UK B
34C	34C	not published	UK C
34D	34D	not published	UK D
34DD	34DD	not published	UK DD
34E	34DDD	not published	UK E
34F	34G	not published	UK F
34G	34I	not published	UK G
34GG	34J	not published	UK GG
34H	34K	not published	UK H
34J	34M	not published	UK J
34K	34O	not published	UK K

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. 2 sizes have no counterpart on the Panache 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

Marks & Spencer size guide, read on 2026-09-18.
Panache size guide, read on 2026-09-17. Panache on TrueToSize

Panache to Marks & Spencer