United Kingdom Size Large to US: Snug / 47mm

United Kingdom Size Large: Corresponds to a nominal width of 57 $\text{mm}$ (2.24 $\text{in}$), length of 200 $\text{mm}$ (7.87 $\text{in}$), average structural girth of 114 $\text{mm}$ (4.49 $\text{in}$), and fit category Large / Roomy.

US: Snug / 47mm: Corresponds to a nominal width of 47 $\text{mm}$ (1.85 $\text{in}$), length of 170 $\text{mm}$ (6.69 $\text{in}$), average structural girth of 94 $\text{mm}$ (3.7 $\text{in}$), and fit category Snug / Slim.