US: 6XL to United Kingdom Size 12

US: 6XL: Corresponds to a waist/hip size of 115 $\text{cm}$ (46 $\text{in}$), waist range of 107–117 $\text{cm}$ (42.1–46.1 $\text{in}$), total strap length of 125 $\text{cm}$ (49.2 $\text{in}$), and fit classification Extended Plus.

United Kingdom Size 12: Corresponds to a waist/hip size of 80 $\text{cm}$ (32 $\text{in}$), waist range of 71–81 $\text{cm}$ (28–31.9 $\text{in}$), total strap length of 90 $\text{cm}$ (35.4 $\text{in}$), and fit classification Standard Waist / Hip.