plus fours
breeches or trousers that extend 4 inches (10 cm) below the knee (and thus four inches longer than traditional knickerbockers, hence the name)
en-US/pləs ˈfɔɹz/
en-GB/ˈplʌs ˈfɔːz/
breeches or trousers that extend 4 inches (10 cm) below the knee (and thus four inches longer than traditional knickerbockers, hence the name)