In the United Kingdom, Ireland and some Commonwealth nations, knickers's a word for women's undergarments. In older usage knickers referred to men's garments such as knickerbockers, also known as plus two's or plus fours in British English . The term knickerbockers has become historic in British English but's used in North American, . The term "knickers"'s still used to refer to nickerbockers in American English. However, the adoption of the term "knickers" to denote a women's undergarment in… (More on Knickers)