bicorne
noun
bi·corne ˈbī-ˌkȯrn 
: cocked hat sense 2
Example Sentences
Recent Examples on the Web To commemorate Napoleon’s victory over Austria at the Battle of Marengo, David painted him charging up a mountain on a piebald steed, right arm pointing skyward, trademark bicorne on his head, cool and cocksure as his horse bucks its front heels. 
Jason Farago, New York Times, 12 Feb. 2020 The whole thing would usually be wrapped up with some tipping of bicorne hats and handshakes, but not this year. NBC News, 10 Sep. 2019 The bicorne had a pre-sale estimate of €30,000 to €40,000 ($34,881 to $46,441). James Rogers, Fox News, 18 June 2018
Jason Farago, New York Times, 12 Feb. 2020 The whole thing would usually be wrapped up with some tipping of bicorne hats and handshakes, but not this year. NBC News, 10 Sep. 2019 The bicorne had a pre-sale estimate of €30,000 to €40,000 ($34,881 to $46,441). James Rogers, Fox News, 18 June 2018 Word History
Etymology
French, from Latin bicornis two-horned, from bi- + cornu horn — more at horn
First Known Use
1936, in the meaning defined above