Bucket Hats

Stone, Khaki, Camouflage

A similar hat is used officially by the U.S. Navy for enlisted service dress uniforms, commonly referred to as a Dixie Cup hat, as in the manufacturer brand. Bucket hats are favored by glider pilots, who require shade in their cockpits but cannot wear wide-brimmed hats because their visibility would be obscured."
Now you know.  I just like them cause they're so dog gone comfortable.