US: 6XL to United Kingdom Size 6

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 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.