US: 3XL (54–56) to United Kingdom Size 50–52

US: 3XL (54–56): Corresponds to a chest width of 137.2–142.2 $\text{cm}$ (54–56 $\text{in}$), neck collar girth of 49.5 $\text{cm}$ (19.5 $\text{in}$), sleeve length of 96.5 $\text{cm}$ (38 $\text{in}$), and fit style Big & Tall Fit.

United Kingdom Size 50–52: Corresponds to a chest width of 127–132.1 $\text{cm}$ (50–52 $\text{in}$), neck collar girth of 47 $\text{cm}$ (18.5 $\text{in}$), sleeve length of 94 $\text{cm}$ (37 $\text{in}$), and fit style Extended Plus Fit.