noun
opera hat; collapsible top hat
A collapsible top hat, also known as a gibus. A loanword from English.
彼はオペラハットをかぶって劇場に入った。
He entered the theater wearing an opera hat.
Variant with interpunct; less common in running text.
シルクハット is a standard (non-collapsible) top hat, while オペラハット is specifically the collapsible kind.
Loanword from English 'opera hat'.