Sizing tool
Suit Jacket Size Chart
Use chest circumference for the numeric size, then check short/regular/long proportions separately.
| US / UK example | EU example | Chest range |
|---|---|---|
| 34 | 44 | 33.75–35.5 in / 86–90 cm |
| 36 | 46 | 35.5–37 in / 90–94 cm |
| 38 | 48 | 37–38.5 in / 94–98 cm |
| 40 | 50 | 38.5–40.25 in / 98–102 cm |
| 42 | 52 | 40.25–41.75 in / 102–106 cm |
| 44 | 54 | 41.75–43.25 in / 106–110 cm |
| 46 | 56 | 43.25–44.75 in / 110–114 cm |
A suit-jacket number still needs length and shoulder checks
Use chest measurement to narrow the numeric jacket size and the international equivalent.
Then check short/regular/long proportions, shoulder shape, sleeve length, waist suppression and trouser drop; those details are not captured by the base number.
Method & references
How this guidance is checked
These sources support the measurement method and help check real-world variation. They are not presented as one universal brand-size table.
- ISO 8559-2:2025 — Size designation of clothes — Primary and secondary dimension indicators — International Organization for Standardization (ISO). Clothing methodology: size designation should be based on defined body measurements rather than assuming universal retail labels.
- Men Size Guide — H&M. Cross-check for men’s EU/US clothing, chest and waist ranges, trousers, jackets, and suit-style numeric references.
- Sizing Guides — Charles Tyrwhitt. Cross-check for shirt neck, chest, sleeve and fit ranges, showing that fit blocks change garment measurements.
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