Product Size:
XS => neck circumference 16cm => Bust 28cm to 32cm
  S => neck circumference 20cm => Bust 30cm to 44cm
M => neck circumference 24cm => Bust 34cm to 52cm
L => neck circumference 34cm => Bust 42cm to 56cm
XL => neck circumference 38cm => Bust 50cm to 68cm