Plus fours are breeches or trousers that extend 4 inches (10 cm) below the knee (and thus four inches longer than traditional knickerbockers, hence the name). Knickerbockers have been traditionally associated with sporting attire since the 1860s. Plus fours were introduced in the 1920s and became popular among sportsmen--particularly golfers and game shooters--as they allowed more freedom of movement than knickerbockers.
An "extravagant, careless style that fit right in with the looser fashions and lifestyles of the 1920s," plus fours were introduced to America by Edward, Prince of Wales (later Edward VIII), during a diplomatic trip in 1924. They are often seen on golf courses, and frequently worn with argyle socks, silk neckties, and dress shirts or sweaters. Some plus fours came as complete suits. They became associated with bicycle fashion in the 1950s and 60s in Great Britain.
- Fashion Encyclopedia, Plus fours.
- Golf Today, Payne Stewart, a champion in plus two's.
- Wilson, Eric. André Benjamin’s Clothing Line Includes Plus Fours and Club Sweaters, The New York Times, October 2, 2008.
- "Esquire's encyclopedia of 20th century men's fashions," by O. E. Schoeffler, William Gale, 1973, p.674