top-hat

adjective

1. of or relating to polite or fashionable society.

noun

1. a tall, cylindrical hat with a stiff brim usually slightly curved on the sides, worn by men especially on formal occasions.Compare beaver¹(def 4), opera hat, silk hat.

noun

1. a man’s hat with a tall cylindrical crown and narrow brim, often made of silk, now worn for some formal occasionsAlso called: high hat

n.

also tophat, 1875, from top (n.1) + hat.