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A hat is a head covering. It may be worn for protection against the elements, for religious reasons, for safety, or as a fashion accessory. [1] In the past, hats were an indicator of social status. In the military, they denote rank and regiment.



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 and dividing by pi. In the UK, an equivalent hat size is an eighth of an inch smaller than in the US. [2] Inches or centimeters may be used depending on the manufacturer. Felt hats can be stretched for a custom fit, and hard hats (such as Derbys and top hats) have a hard goss which can be melted to adjust size. Cheaper hats come in standard sizes, such as small, medium, large. Some hats, like baseball caps, are adjustable.

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