United Kingdom Size XL (Extra Tall) to US: A / XS

United Kingdom Size XL (Extra Tall): Corresponds to a stature height range of 168–180 $\text{cm}$ (66–71 $\text{in}$), weight range of 70–85 kg (154–187 lbs), denier rating 30D–100D Heavy Opaque / Control, and fit classification Tall / Generous Rise Fit.

US: A / XS: Corresponds to a stature height range of 145–158 $\text{cm}$ (57–62 $\text{in}$), weight range of 40–52 kg (88–115 lbs), denier rating 15D–40D Sheer / Standard, and fit classification Petite / Short Stature Fit.