US: 48 to United Kingdom Size 36

US: 48: Corresponds to a waist size of 120 $\text{cm}$ (48 $\text{in}$), total strap length of 135 $\text{cm}$ (53.1 $\text{in}$), and recommended fit classification Extended / Plus.

United Kingdom Size 36: Corresponds to a waist size of 90 $\text{cm}$ (36 $\text{in}$), total strap length of 105 $\text{cm}$ (41.3 $\text{in}$), and recommended fit classification Standard / Regular.