top hat
US /ˈtɑːp ˌhæt/
UK /ˈtɑːp ˌhæt/
1.
a man's formal hat with a high, cylindrical crown, worn especially with a tailcoat or morning coat
:
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The magician pulled a rabbit out of his top hat.
•
He wore a tuxedo and a shiny black top hat to the formal event.