United Kingdom Size 7 3/8 to US: S

Cross-market women’s hat conversion mapping 7 3/8 specifications into S.

Analyzing Hat Size Equivalence Across Markets

United Kingdom Size 7 3/8: Features a head circumference of 60.5 $\text{cm}$ (23.8 $\text{in}$ ) measured just above the brow and ears.

US: S: Features a head circumference of 54.5 $\text{cm}$ (21.5 $\text{in}$ ) measured just above the brow and ears.