Marks & Spencer to Brooks bra size
The short answer
Marks & Spencer 34C is Brooks M by the two brands' own charts.
The target brand sells lettered sizes that each cover a block of band and cup sizes.
| Marks & Spencer | Marks & Spencer builds it for | Brooks, by chart | Same label | Brooks builds it for | Brooks also prints |
|---|---|---|---|---|---|
| 34AA | not published | S | not published | not published | not published |
| 34A | not published | M | not published | not published | not published |
| 34B | not published | M | not published | not published | not published |
| 34C | not published | M | not published | not published | not published |
| 34D | not published | L | not published | not published | not published |
| 34DD | not published | L | not published | not published | not published |
| 34E | not published | XL | not published | not published | not published |
| 34F | not published | not made | not published | not published | not published |
| 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.
- Brooks size guide, read on 2026-09-18. Brooks on TrueToSize