trouser,
pant a garment (or part of a garment) designed for or relating to trousers; "in his trouser's pocket"; "he ripped his left trouser on the fence"
Knickers is a word that is used to describe women's and occasionally (but quite rarely) men's underpants and undergarments, women's lingerie, and for sports pants sportswear. In the United States it more commonly used as a short form for Knickerbockers, a type of golfing pants, also called Plus fours. The word carries a naughty or playful connotation, which keeps it in use in the media.
OmegaWiki Dictionary
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knickers Piece of cloth adapted to cover the genitals and buttocks of a man or a woman.