hat with a round flat crown and a brim that can be turned up or down
porkpie in American English
(ˈpɔrkˌpai, ˈpourk-)
noun
a snap-brimmed hat with a round, flat crown, usually made of felt
Word origin
[1725–35; pork + pie1]This word is first recorded in the period 1725–35. Other words that entered Englishat around the same time include: copyright, postmortem, roulette, snowflake, viburnum