US: S to United Kingdom Size 16

US: S: Corresponds to a waist/hip size of 75 $\text{cm}$ (30 $\text{in}$), waist range of 66–76 $\text{cm}$ (26–29.9 $\text{in}$), total strap length of 85 $\text{cm}$ (33.5 $\text{in}$), and fit classification Standard Waist / Hip.

United Kingdom Size 16: Corresponds to a waist/hip size of 90 $\text{cm}$ (36 $\text{in}$), waist range of 81–91 $\text{cm}$ (31.9–35.8 $\text{in}$), total strap length of 100 $\text{cm}$ (39.4 $\text{in}$), and fit classification Relaxed Waist / Hip.