Words for the bottom half of female lingerie: pants (US) versus knickers, drawers or panties, but never pants! (UK). 'Briefs' is another possible. 'French knickers' = knickers with frills, looser-fitting. Note the French "cache-sex" as a prototype 'G-string. Other types of undergarments are spandex shorts common for women who workout. These shorts are used because it supports the behind and the back for good posture.