Q wearing a bicorne
A bicorne was a type of military hat that originated on Earth during the late 18th century, often worn as part of a French Army uniform.
American General George Washington wore a bicorne hat during the American Revolution. (TOS: "The Cage")
Q as a Marshal of France wore a bicorne, as did the man he was emulating, Napoléon Bonaparte. (TNG: "Hide And Q"; TOS: "The Squire of Gothos", "Space Seed")
George Washington wearing a bicorne
Napoléon wearing a bicorne