(from the article `dress`) ...suit, with a jacket instead of a tailcoat, was introduced in the 1850s for informal occasions. In the last two decades of the century a more ... Found on http://www.britannica.com/eb/a-z/k/40
Knickerbockers are loose, full breeches, which are gathered below the knee and fastened by a button or buckle. They have been worn by men since the 18th century, and became an integral part of sporting attire for women in the 1980s. Found on http://www.probertencyclopaedia.com/browse/PK.HTM