US: 54-56 to United Kingdom Size 50-52

US: 54-56: Corresponds to a relaxed chest range of 130–134 $\text{cm}$ (51.2–52.8 $\text{in}$), elastic waist range of 116–122 $\text{cm}$ (45.7–48 $\text{in}$), and fit classification Loose Lounge Fit.

United Kingdom Size 50-52: Corresponds to a relaxed chest range of 122–126 $\text{cm}$ (48–49.6 $\text{in}$), elastic waist range of 108–114 $\text{cm}$ (42.5–44.9 $\text{in}$), and fit classification Loose Lounge Fit.