Opera hat which means hat, and "claque", which means "tap" or "click". The "chapeau claque" is thus a hat that folds with a click, and unfolds likewise. In English the hat model is usually referred to as a "collapsible top-hat", "gibus" or more often "opera hat"- The construction may originally have been inspired by an historical hat model called "chapeau bras" ("arm hat"), made as bicorne or tricorne to be carried folded under the arm On May 5, 1812, a London hatter called Thomas Francis Dollman patented a design for "an elastic round hat" supported by ribs and springs. His patent was
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