United Kingdom Size 16–18 to US: XS (0–2)

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: XS (0–2): Bust interval range of 80–85 $\text{cm}$ (31.5–33.5 $\text{in}$), natural waist range of 58.4–63.5 $\text{cm}$ (23–25 $\text{in}$), shoulder width of 36.8 $\text{cm}$ (14.5 $\text{in}$), sleeve length of 76.2 $\text{cm}$ (30 $\text{in}$), style variants Tank Tops, Camisoles, Slim T-Shirts & Fitted Sweaters, and fit classification Petite Contour Fit.