United Kingdom Size 48 to US: 28

United Kingdom Size 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.

US: 28: Corresponds to a waist size of 70 $\text{cm}$ (28 $\text{in}$), total strap length of 85 $\text{cm}$ (33.5 $\text{in}$), and recommended fit classification Snug / Tailored.