US / UK suit to EU suit size
The short answer
By the formula, US / UK suit 44 is EU suit 54.
A US or UK jacket size is the chest in inches; the continental size is that number plus 10. Length letters (S, R, L) are a separate code and do not convert by number.
| US / UK suit | EU suit |
|---|---|
| 34 | 44 |
| 36 | 46 |
| 38 | 48 |
| 40 | 50 |
| 42 | 52 |
| 44 | 54 |
| 46 | 56 |
| 48 | 58 |
| 50 | 60 |
| 52 | 62 |
| 54 | 64 |