the.com/knickers

means A British term for women's underpants, often used in the plural phrase 'get your knickers in a twist,' meaning to become needlessly upset.

from Short for 'knickerbockers,' loose-fitting breeches gathered at the knee, named after Diedrich Knickerbocker — the fictional Dutch-American historian Washington Irving invented as the supposed author of his comic 'History of New York.' Illustrators later drew old Dutch settlers in baggy knee-length trousers, and the name stuck to that style of pants. 'Knickerbockers' got clipped to 'knickers' and, in Britain, drifted from outerwear to underwear, eventually settling on women's undergarments specifically — leaving Americans with 'knickers' as a historical footnote and the Brits with a word that still makes everyone snicker.