Top hat top hat is a hard, black silk hat, with fur now often used. The acceptable colors of hats are much as they have traditionally been, with "white" hats (which are actually grey), a daytime racing color, worn at the less formal occasions demanding a top hat, such as Royal Ascot, or with a morning suit. In the U.S. top hats are worn widely in coaching, a driven horse discipline as well as for formal riding to hounds. The collapsible silk opera hat, or "crush hat", is still worn on occasions, and black in color if worn with evening wear as
Top hat in the Bank of England and City stockbroking, and boys at some public schools. All the civilian members of the Japanese delegation that signed the Japanese Instrument of Surrender on 2 September 1945, wore top hats, reflecting common diplomatic practice at the time. The top hat persisted in politics and international diplomacy for many years. In the Soviet Union, there was debate as to whether its diplomats should follow the international conventions and wear a top hat. Instead a diplomatic uniform with peaked cap for formal occasions was adopted. Top hats were part of formal wear for U.S. presidential inaugurations