UK to US Suit Size Conversion
| US/UK Chest (in) | US/UK Chest (in) |
|---|---|
| 36 | 36 |
| 38 | 38 |
| 40 | 40 |
| 42 | 42 |
| 44 | 44 |
| 46 | 46 |
| 48 | 48 |
Sizing conventions vary by brand and by cut — this table shows the standard published conversion. Always check the garment's own size chart when one is available. See how these tables are compiled.
Reversed, a UK 42 suit is a US 42 — no numeric conversion needed, since both countries size by the same chest-inch measurement, making this page mainly a confirmation for a UK buyer ordering from a US tailor or retailer.
What's worth checking instead of the size number is drop and shoulder structure, since US suit brands have traditionally cut a roomier, less structured jacket than the UK tailoring tradition at the same nominal chest size.
Frequently asked questions
What should I actually check buying a US suit as a UK size 42?
The jacket's cut and shoulder structure, not the size number — US suits at the same chest measurement have traditionally been cut roomier and less structured than UK tailoring.