US: 18 2XL to United Kingdom Size 8

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 8: Features a height of 168 $\text{cm}$ (66.1 $\text{in}$), bust contour of 86 $\text{cm}$ (33.9 $\text{in}$), waist shaping of 67 $\text{cm}$ (26.4 $\text{in}$), hip flare of 92 $\text{cm}$ (36.2 $\text{in}$), and silhouette cut: Natural Waist / Frock.