United Kingdom Size 38–40 to US: 2XL (42–44)

United Kingdom Size 38–40: Corresponds to a waist stretch range of 96.5–101.6 $\text{cm}$ (38–40 $\text{in}$), hip circumference of 111.8 $\text{cm}$ (44 $\text{in}$), thigh clearance of 63 $\text{cm}$ (24.8 $\text{in}$), and fit style Relaxed Boxers & Extended Boxer Briefs.

US: 2XL (42–44): Corresponds to a waist stretch range of 106.7–111.8 $\text{cm}$ (42–44 $\text{in}$), hip circumference of 119.4 $\text{cm}$ (47 $\text{in}$), thigh clearance of 67 $\text{cm}$ (26.4 $\text{in}$), and fit style Extended Boxers & Plus Boxer Briefs.