US: M (38–40) to United Kingdom Size 42–44

US: M (38–40): Corresponds to a chest width of 96.5–101.6 $\text{cm}$ (38–40 $\text{in}$), neck collar girth of 39.4 $\text{cm}$ (15.5 $\text{in}$), sleeve length of 86.4 $\text{cm}$ (34 $\text{in}$), and fit style Classic Regular Fit.

United Kingdom Size 42–44: Corresponds to a chest width of 106.7–111.8 $\text{cm}$ (42–44 $\text{in}$), neck collar girth of 41.9 $\text{cm}$ (16.5 $\text{in}$), sleeve length of 88.9 $\text{cm}$ (35 $\text{in}$), and fit style Comfort Fit.