1. Loose breeches gathered in under the knee.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• knickerbocker's,
• knikerbocker,
• knickerbocker,
• jnickerbockers,
• mnickerbockers,
• lnickerbockers,
• onickerbockers,
• inickerbockers,
• kbickerbockers,
• kmickerbockers,
• kjickerbockers,
• khickerbockers,
• knickerbockerz,
• knickrbockers,
• knickerbokers,
• knikcerbockers,
• knickerbokkers,
• knickerbockr,
• knickerbackers,
• knickerbockters

• Knickerbocker.

The adjective form of "knickerbockers" is "knickerbocker". For example, you can say "He wore a pair of knickerbocker pants".