Translation guide
Knickerbockers are a type of loose-fitting trousers gathered at the knee or just below, historically worn for sports or outdoor activities. In modern Japanese, the term is primarily known as a loanword, but the garment itself is not common in everyday life.
The learner wants to refer to the specific historical garment, often associated with golf, cycling, or early 20th-century fashion.
Direct loanword from English. This is the standard term in Japanese for the historical garment, though it may not be widely recognized by all speakers.
He wore knickerbockers when playing golf.
Shortened form of ニッカーボッカーズ. Slightly more casual, but still refers to the same garment.
Literally 'half trousers' or shorts. This is a generic term for knee-length or shorter pants, but can be used to describe knickerbockers in context. However, it does not specifically convey the gathered-at-knee feature.
半ズボン is a broad term for shorts; it may not accurately describe knickerbockers unless the context makes it clear.
Knickerbockers are not a common garment in modern Japan. The loanword ニッカーボッカーズ is recognized mainly in historical or fashion contexts. In everyday conversation, describing the garment by its features (e.g., 膝下で絞ったゆったりしたズボン) might be more effective than using the direct loanword.
昔のサイクリストはニッカーズを着ていた。
Cyclists in the old days wore knickerbockers.
That boy is wearing shorts.