US: 5 to Europe Size 80

US: 5: Corresponds to a height baseline of 110 $\text{cm}$ (43.3 $\text{in}$), a weight baseline of 19 $\text{kg}$ (42 $\text{lbs}$), and a chest baseline of 60 $\text{cm}$ (23.6 $\text{in}$).

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 $\text{in}$).