Translation guide
A close-fitting knitted cap, often worn by sailors or in cold weather. In Japanese, this is typically referred to as a ニット帽 or ウォッチキャップ, with some nuance in style.
A close-fitting, brimless knitted cap, often with a folded cuff, worn for warmth or as a fashion item.
The most common and general term for a knitted cap or beanie. It covers a wide range of styles, including watch caps.
寒いのでニット帽をかぶった。
I wore a knit cap because it was cold.
A direct loanword from English, specifically referring to the classic sailor-style watch cap. It is understood but less common than ニット帽.
彼はウォッチキャップを深くかぶっていた。
He wore his watch cap pulled down low.
From English 'beanie'. Used in fashion contexts, but may not be widely recognized by all Japanese speakers. Often associated with a more modern or streetwear style.
そのブランドのビーニーが欲しい。
I want that brand's beanie.