US: 18 2XL to United Kingdom Size 4

US: 18 2XL: Features a height of 175 $\text{cm}$ (68.9 $\text{in}$), bust contour of 122 $\text{cm}$ (48 $\text{in}$), waist shaping of 103 $\text{cm}$ (40.6 $\text{in}$), hip flare of 128 $\text{cm}$ (50.4 $\text{in}$), and silhouette cut: Relaxed / A-Line Frock.

United Kingdom Size 4: Features a height of 160 $\text{cm}$ (63 $\text{in}$), bust contour of 78 $\text{cm}$ (30.7 $\text{in}$), waist shaping of 60 $\text{cm}$ (23.6 $\text{in}$), hip flare of 84 $\text{cm}$ (33.1 $\text{in}$), and silhouette cut: Petite / Fitted Bodycon.