noun
A hard felt hat with a rounded crown, originally from Britain. In Japanese, it is a straightforward loanword and may be used in fashion or historical contexts. The cross-reference 山高帽子 is a native Japanese term for a similar hat.
See also: 山高帽子
彼はボーラーハットをかぶってパーティーに行った。
He went to the party wearing a bowler hat.