One of the most common mistakes buyers make when shopping Italian tailoring is assuming that EU sizing converts cleanly to US sizing.
It doesn’t.
In theory, a size 56 EU corresponds to a US 46. In practice, that assumption breaks down quickly, especially with Italian jackets. Different makers cut differently, silhouettes vary, and many pre-owned garments have been altered by previous owners. The number on the tag is only a reference point, not a guarantee of fit.
This is why so many buyers feel unsure when shopping Italian tailoring online. Once you understand the math behind the sizing, that uncertainty disappears.
The Actual Math Behind EU and US Jacket Sizes
European jacket sizing is based on chest width measured flat in centimeters, not inches.
A size 56 EU jacket is derived from a chest measurement of 56 centimeters measured pit-to-pit, taken flat across the front of the jacket.
Here’s the conversion:
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56 centimeters ÷ 2.54 = approximately 22 inches
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A jacket measuring 22 inches pit-to-pit has a 44 inch chest circumference
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A 44 inch chest corresponds to a US 44, not a US 46
Over time, many retailers began loosely marketing a 56 EU as a US 46 to account for ease, padding, or vanity sizing. In Italian tailoring, particularly Neapolitan tailoring, that assumption is often inaccurate. Many size 56 Italian jackets fit closer to a US 44, especially when cut trim or previously tailored.
This is why measurements matter more than the label.
EU to US Jacket Size Conversion
(Based on Actual Measurements, Not Retail Guesswork)
| EU Size | Pit-to-Pit (cm) | Pit-to-Pit (in) | Chest Circumference (in) | Typical US Fit |
|---|---|---|---|---|
| 48 EU | 48 cm | 18.9 in | ~38 in | US 38 |
| 50 EU | 50 cm | 19.7 in | ~40 in | US 40 |
| 52 EU | 52 cm | 20.5 in | ~41–42 in | US 42 |
| 54 EU | 54 cm | 21.3 in | ~43–44 in | US 44 |
| 56 EU | 56 cm | 22.0 in | ~44 in | US 44 (often mislisted as 46) |
| 58 EU | 58 cm | 22.8 in | ~46 in | US 46 |
| 60 EU | 60 cm | 23.6 in | ~48 in | US 48 |
Why Two Size 56 Jackets Can Fit Completely Differently
Even with the same pit-to-pit measurement, jackets can wear very differently due to:
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Shoulder construction and padding
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Armhole height
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Fabric weight and drape
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Canvas structure
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Prior tailoring
Italian tailoring is not standardized the way American suiting often is. One maker’s size 56 may feel close and athletic, another relaxed and draped. Add tailoring into the mix, and the number on the tag becomes even less meaningful.
This is why we never rely on tag size alone. Have any questions
