Triumph to Marks & Spencer bra size
The short answer
Triumph 75I is Marks & Spencer 34G by the two brands' own charts.
Cups are counted along each brand's own letter order, and the band is carried across unchanged.
| Triumph | Triumph builds it for | Marks & Spencer, by chart | Same label | Marks & Spencer builds it for | Marks & Spencer also prints |
|---|---|---|---|---|---|
| 75AA | not published | 34AA | not published | not published | not published |
| 75A | not published | 34A | not published | not published | not published |
| 75B | not published | 34B | not published | not published | not published |
| 75C | not published | 34C | not published | not published | not published |
| 75D | not published | 34D | not published | not published | not published |
| 75E | not published | 34DD | not published | not published | not published |
| 75F | not published | 34E | not published | not published | not published |
| 75G | not published | 34F | not published | not published | not published |
| 75H | not published | not made | not published | not published | not published |
| 75I | not published | 34G | not published | not published | not published |
| 75J | not published | 34GG | 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
- Triumph size guide, read on 2026-09-18.
- Marks & Spencer size guide, read on 2026-09-18.