True & Co to Marks & Spencer bra size
The short answer
True & Co XL is Marks & Spencer 40C by the two brands' own charts.
Cups are counted along each brand's own letter order, and the band is carried across unchanged.
| True & Co | True & Co builds it for | Marks & Spencer, by chart | Same label | Marks & Spencer builds it for | Marks & Spencer also prints |
|---|---|---|---|---|---|
| XS | not published | 32C | not published | not published | not published |
| S | not published | 34C | not published | not published | not published |
| M | not published | 36C | not published | not published | not published |
| L | not published | 38C | not published | not published | not published |
| XL | not published | 40C | not published | not published | not published |
| 1X | not published | 42C | not published | not published | not published |
| 2X | not published | 44C | not published | not published | not published |
| 3X | not published | 46C | 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
- True & Co size guide, read on 2026-09-18. True & Co on TrueToSize
- Marks & Spencer size guide, read on 2026-09-18.