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 25 Formit sold a few yachts they called the Top Hat 30 and 32, but they were from another design and the only connection is the name. These so-called Top Hats are not considered to be Top Hats. Top Hat 25 Top Hat 25 is a series of English designed yachts made in Australia from 1964 to 1986. It came in four different 'marks' (models) named Mk 0 - III. After the Mk III, another model, the Top Hat 27, was launched in 1986. The cold moulded model from 1963, four 3 mm laminations laid up with resorcinol glue on mahogany