Noun
The name for a style of short breeches; smallclothes.
Source: Webster's dictionaryI was perfectly satisfied with the West Side of Chicago when I was in knickerbockers. I hope it was with me. Charles Comiskey
Several other rules also brought the Knickerbockers' game close to the modern one, though a ball caught on the first bounce was, again, an out and only underhand pitching was allowed. Source: Internet