United Kingdom Size 34–36 to US: XL (38–40)

United Kingdom Size 34–36: Corresponds to a waist stretch range of 86.4–91.4 $\text{cm}$ (34–36 $\text{in}$), hip circumference of 104 $\text{cm}$ (41 $\text{in}$), thigh clearance of 59 $\text{cm}$ (23.2 $\text{in}$), and fit style Briefs, Boxers & Boxer Briefs.

US: XL (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.