US: S/M to Europe Size 42

US: S/M: Features a chest width of 96 $\text{cm}$ (37.8 $\text{in}$), shoulder breadth of 45 $\text{cm}$ (17.7 $\text{in}$), and sleeve length of 85 $\text{cm}$ (33.5 $\text{in}$) with built-in layering allowance.

Europe Size 42: Features a chest width of 88 $\text{cm}$ (34.6 $\text{in}$), shoulder breadth of 42 $\text{cm}$ (16.5 $\text{in}$), and sleeve length of 81 $\text{cm}$ (31.9 $\text{in}$) with built-in layering allowance.