US: 18 2XL to United Kingdom Size 12

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 12: Features a height of 172 $\text{cm}$ (67.7 $\text{in}$), bust contour of 94 $\text{cm}$ (37 $\text{in}$), waist shaping of 75 $\text{cm}$ (29.5 $\text{in}$), hip flare of 100 $\text{cm}$ (39.4 $\text{in}$), and silhouette cut: Natural Waist / Evening Gown.