US: 24 to United Kingdom Size 16-18

US: 24: Corresponds to a relaxed bust range of 121–125 $\text{cm}$ (47.6–49.2 $\text{in}$), elastic waist range of 103–108 $\text{cm}$ (40.6–42.5 $\text{in}$), and comfort drape classification Loose Lounge Fit.

United Kingdom Size 16-18: Corresponds to a relaxed bust range of 97–101 $\text{cm}$ (38.2–39.8 $\text{in}$), elastic waist range of 79–84 $\text{cm}$ (31.1–33.1 $\text{in}$), and comfort drape classification Relaxed / Comfort Drape.