US: 4 Petite to Europe Size 30 Petite

US: 4 Petite: Corresponds to a bust girth of 86.4 $\text{cm}$ (34 $\text{in}$), waist girth of 66 $\text{cm}$ (26 $\text{in}$), hip girth of 91.4 $\text{cm}$ (36 $\text{in}$), stature variant Petite (Under 163 cm / Under 5’4”), and fit classification Petite Tailored Fit.

Europe Size 30 Petite: Corresponds to a bust girth of 78.7 $\text{cm}$ (31 $\text{in}$), waist girth of 58.4 $\text{cm}$ (23 $\text{in}$), hip girth of 83.8 $\text{cm}$ (33 $\text{in}$), stature variant Petite (Under 163 cm / Under 5’4”), and fit classification Petite Tailored Fit.