Young Brunette Girl With A Blue Scarf Wearing A Hat On The Hill Above The Sea

• Zucchetto - Skullcap worn by clerics.
Hat size
Hat sizes are determined by measuring the circumference of a person's head about 1/2 inch (1.3 cm) above the ears. Inches or centimeters may be used depending on the manufacturer. Felt hats can be stretched for a custom fit. Some hats, like hard hats and baseball caps, are adjustable. Cheaper hats come in standard sizes, such as small, medium, large.