United Kingdom Size 6 to US: L

United Kingdom Size 6: Corresponds to a waist/hip size of 70 $\text{cm}$ (28 $\text{in}$), waist range of 60–70 $\text{cm}$ (23.6–27.6 $\text{in}$), total strap length of 80 $\text{cm}$ (31.5 $\text{in}$), and fit classification Waist / Snug Cinch.

US: L: Corresponds to a waist/hip size of 85 $\text{cm}$ (34 $\text{in}$), waist range of 76–86 $\text{cm}$ (29.9–33.9 $\text{in}$), total strap length of 95 $\text{cm}$ (37.4 $\text{in}$), and fit classification Standard Waist / Hip.