bontan pants; baggy trousers
A style of extremely wide-legged, harem-like trousers, strongly associated with 1980s Japanese high school delinquents (yankī). Often worn as part of a school uniform modification. Compare ニッカーズボン.
See also: ニッカーズボン
In the 80s, delinquents wore bontan pants to school.
That shop sells old-style bontan pants.