long men's underpants; loose Bermuda-style underpants
A type of men's underwear resembling loose, knee-length shorts, often worn under trousers. Considered old-fashioned by younger generations but still used for comfort or as loungewear.
夏はステテコで過ごすのが涼しくて好きだ。
In summer, I like spending time in step-in underpants because it's cool.
祖父はいつもステテコをはいている。
My grandfather always wears long underpants.
Named after the ステテコ踊り, a comic dance popularized in the Meiji period by the rakugo performer 初代三遊亭圓遊; the garment worn for the dance subsequently took the name.