A hat is a head covering.
It can be worn for protection against the elements, for ceremonial reason, religious reasons, for safety, or as a fashion accessory. In the past, hats were an indicator of social status. In the military, they may denote nationality, branch of service, rank and/or regiment.
Women’s decorative hat fashion from 1911.
Ancient Greek statue of a lady with blue and gilt garment, a fan and a sun hat, from Tanagra, circa 325-300 BC.
Hats as an indicator of social status: a foreman (with horse) wears a hat of greater height than the accompanying inquilino (19th-centuryChile).
New York City, 1918: A large crowd of people, almost all wearing hats.