US: 6 to Europe Size 80

US: 6: Corresponds to a height baseline of 116 $\text{cm}$ (45.7 $\text{in}$), a weight baseline of 21 $\text{kg}$ (46 $\text{lbs}$), and a chest baseline of 62 $\text{cm}$ (24.4 $\text{in}$).

Europe Size 80: Corresponds to a height baseline of 80 $\text{cm}$ (31.5 $\text{in}$), a weight baseline of 11 $\text{kg}$ (24 $\text{lbs}$), and a chest baseline of 50 $\text{cm}$ (19.7 $\text{in}$).