Opera hat described as: Some sources have taken this to describe an early folding top hat, although it is not explicitly stated whether Dollman's design was specifically for male or female headgear. Dollman's patent expired in 1825. Operating from Poissy, Paris, France, around 1840, Antoine Gibus's design for a spring-loaded collapsible top-hat proved so popular that hats made to it became known as "gibus". They were also often called "opera hats" due to the common practice of storing them in their flattened state under one's seat at the opera, though the term can also refer to any tall formal men's hat. The
Top hat silk top hat in England is credited to George Dunnage, a hatter from Middlesex, in 1793. The invention of the top hat is often erroneously credited to a haberdasher named John Hetherington. Within 30 years top hats had become popular with all social classes, with even workmen wearing them. At that time those worn by members of the upper classes were usually made of felted beaver fur; the generic name "stuff hat" was applied to hats made from various non-fur felts. The hats became part of the uniforms worn by policemen and postmen (to give them the appearance of authority);