Top hat ribs and springs. His patent was 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. In 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
Top hat standard covering is now fur plush or "melusine" as (the London hat merchant) Christys' calls it. A grey flat fur felt top hat is the popular alternative. It is common to see top hats in stiff wool felt and even soft wool though these are not considered on the same level as the silk or fur plush or grey felt varieties. The standard crown shape nowadays is the 'semi-bell crown'; 'full bell crowns' and 'stovepipe' shaped toppers are rarer. Because of the rarity of vintage silk hats, and the expense of modern top hats, the vintage/antique market is very lively,