porkpie hat
A hat with a flat top and a slightly curved brim going all the way around the crown. It is similar to a fedora and trilby, but it is shorter with no pinched front. Pork pie hats are often associated with jazz, blues and ska musicians and fans.
Do not confuse with boater hat, boater hats have stiff brims and are often made of straw.
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See also
This tag implicates hat (learn more).