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Stirrups are uniform socks commonly worn by baseball players up until the mid-1990s, when major-league players began wearing their pants down to the ankles, setting a trend soon picked up by players in minor and amateur leagues. Until then, stirrup socks had been an integral part of the traditional baseball uniform, giving them a distinctive look. A high sock was needed because baseball players wore knickerbockers ("knickers"), worn by many boys in the late 19th century and into the 20th century. 

Stirrup socks are worn on top of long socks called "sanitaries," usually white in color.