knickers

Concise Oxford English Dictionary © 2008 Oxford University Press:
knickers/ˈnɪkəz/

▶plural noun Brit.

• 1 a woman's or girl's undergarment, covering the body from the waist or hips to the top of the thighs and having two holes for the legs.

• 2 N. Amer. knickerbockers.

– phrases
get one's knickers in a twist Brit. informal become upset or angry.

– derivatives
knickered adjective,
knickerless adjective.

– origin C19: abbrev. of knickerbockers (see knickerbocker).