Definition of plus fours in English:

plus fours

plural noun

dated
  • Baggy knickers reaching below the knee, worn especially by men for playing golf.

    • ‘Since then he has exhibited worldwide - at overseas exhibitions he plays his Englishness to the hilt by turning up wearing plus fours and a deerstalker.’
    • ‘His Royal Highness, the Prince of Wales, arrived by train overnight, pulled on his plus fours and a beret, grabbed his shooting stick and headed for Carnoustie for the final day of the 1931 Open.’
    • ‘Several male refugees packed plus fours in the belief that they constituted an essential part of a respectable Englishman's wardrobe.’
    • ‘He added that more and more businessmen are interested in donning plus fours and participating in a day's shooting.’
    • ‘I walked into his office to find him dressed in his plus fours and swinging a nine iron.’

Origin

1920s: so named because the overhang at the knee requires an extra four inches of material.

Pronunciation:

plus fours

/ˌpləs ˈfôrz/