Marks & Spencer to Bras N Things bra size
The short answer
Marks & Spencer 34D is Bras N Things 12D by the two brands' own charts.
Cups are counted along each brand's own letter order, and the band is carried across unchanged.
| Marks & Spencer | Marks & Spencer builds it for | Bras N Things, by chart | Same label | Bras N Things builds it for | Bras N Things also prints |
|---|---|---|---|---|---|
| 34AA | not published | not made | not published | not published | not published |
| 34A | not published | 12A | not published | not published | UK A · US A · EU A · FR A |
| 34B | not published | 12B | not published | not published | UK B · US B · EU B · FR B |
| 34C | not published | 12C | not published | not published | UK C · US C · EU C · FR C |
| 34D | not published | 12D | not published | not published | UK D · US D · EU D · FR D |
| 34DD | not published | 12DD | not published | not published | UK DD · US DD · EU E · FR E |
| 34E | not published | 12E | not published | not published | UK E · US DDD · EU F · FR F |
| 34F | not published | 12F | not published | not published | UK F · US F · EU G · FR G |
| 34G | not published | not made | not published | not published | not published |
| 34GG | not published | not made | not published | not published | not published |
| 34H | not published | not made | not published | not published | not published |
| 34J | not published | not made | not published | not published | not published |
| 34K | not published | not made | not published | not published | not published |
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.
Sources
- Marks & Spencer size guide, read on 2026-09-18.
- Bras N Things size guide, read on 2026-09-18.