United Kingdom Size 24–26 to US: XL (16–18)

United Kingdom Size 24–26: Waist contouring range of 91.4–96.5 $\text{cm}$ (36–38 $\text{in}$), full hip range of 116.8–121.9 $\text{cm}$ (46–48 $\text{in}$), style variants Extended Plus Briefs & High-Waist Cuts, and fit classification Extended Plus Fit.

US: XL (16–18): Waist contouring range of 83.8–88.9 $\text{cm}$ (33–35 $\text{in}$), full hip range of 109.2–114.3 $\text{cm}$ (43–45 $\text{in}$), style variants Full Briefs, High-Waist & Boy Shorts, and fit classification Generous Full Fit.