Sizing tool
Suit Size Chart
Use chest circumference to find a starting jacket number.
| 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 |
Chest number is only the beginning
The numeric jacket size is commonly anchored to chest measurement, but shoulder fit, jacket length, sleeve length, waist suppression, and trouser drop remain separate decisions.
A correct numeric conversion can still require tailoring, especially in structured suits.
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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