Knick·er·bock·er 
(nĭkər-bŏk′ər)
(nĭkər-bŏk′ər)n.
1.
a. A descendant of the Dutch settlers of New York.
b. A native or inhabitant of New York.
2. knickerbockers Full breeches gathered and banded just below the knee; knickers.
[After Diedrich Knickerbocker, fictitious author of History of New York by Washington Irving.]