United Kingdom Size 16–18 to US: XL (16–18)

United Kingdom Size 16–18: Bust interval range of 97.8–104.1 $\text{cm}$ (38.5–41 $\text{in}$), natural waist range of 76.2–82.6 $\text{cm}$ (30–32.5 $\text{in}$), shoulder width of 41.3 $\text{cm}$ (16.25 $\text{in}$), sleeve length of 80 $\text{cm}$ (31.5 $\text{in}$), style variants Blouses, T-Shirts, Tank Tops, Sweaters & Cardigans, and fit classification Relaxed Comfort Fit.

US: XL (16–18): Bust interval range of 105.4–111.8 $\text{cm}$ (41.5–44 $\text{in}$), natural waist range of 83.8–90.2 $\text{cm}$ (33–35.5 $\text{in}$), shoulder width of 43.2 $\text{cm}$ (17 $\text{in}$), sleeve length of 81.3 $\text{cm}$ (32 $\text{in}$), style variants Relaxed Blouses, T-Shirts, Sweaters & Tunics, and fit classification Generous Full Fit.