United Kingdom Size M (Medium) to US: A / XS

United Kingdom Size M (Medium): Corresponds to a stature height range of 152–165 $\text{cm}$ (60–65 $\text{in}$), weight range of 50–62 kg (110–136 lbs), denier rating 15D–60D Sheer to Opaque, and fit classification Standard / Regular 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.