United Kingdom Size 28 to US: 16-18

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: 16-18: Corresponds to a relaxed bust range of 105–109 $\text{cm}$ (41.3–42.9 $\text{in}$), elastic waist range of 87–92 $\text{cm}$ (34.3–36.2 $\text{in}$), and comfort drape classification Loose Lounge Fit.