United Kingdom Size 28 to US: 20-22

United Kingdom Size 28: 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.

US: 20-22: Corresponds to a relaxed bust range of 113–117 $\text{cm}$ (44.5–46.1 $\text{in}$), elastic waist range of 95–100 $\text{cm}$ (37.4–39.4 $\text{in}$), and comfort drape classification Loose Lounge Fit.