United Kingdom Size 54-56 to US: 42-44

United Kingdom Size 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.

US: 42-44: Corresponds to a relaxed chest range of 106–110 $\text{cm}$ (41.7–43.3 $\text{in}$), elastic waist range of 92–98 $\text{cm}$ (36.2–38.6 $\text{in}$), and fit classification Relaxed / Comfort Fit.