US: 5XL to United Kingdom Size 16

US: 5XL: Corresponds to a waist/hip size of 110 $\text{cm}$ (44 $\text{in}$), waist range of 102–112 $\text{cm}$ (40.2–44.1 $\text{in}$), total strap length of 120 $\text{cm}$ (47.2 $\text{in}$), and fit classification Extended Plus.

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.