Flashy Panties For Menstrual Period

In British English, and in places such as the UK, Ireland, South Africa, India, and occasionally in other Commonwealth nations such as Australia and New Zealand, panties are often referred to as knickers. The term knickers is not generally used in the US and Canada, where the term "panties" is usually favored. In the UK, pants is also used, but can mean men's or women's underwear. This should not be confused with the North American usage of pants which are called trousers in the UK.
History
In the 1940s, new styles of women's undergarments became available in the West that possessed a greater sense of sexuality focused on comfort and individuality, versus functionality and conformance to a certain body type; they were glamorized even more by models such as Bettie Page.