Granny panties
From Voyeurweb's Wiki about Sex
Granny panties is a nickname for women's briefs made in a full-cut style rather than a bikini or high-cut style. Some people associate this style of underwear with social conservatism or older women (hence the name), but many women wear this style of underwear for reasons of comfort or to achieve a smoother line (without a panty line) under their slacks.
