People who wear granny underwear usually wear it because
A) their mom bought it for them
B) they don't like thongs or bikini cuts
C) they're playing some kind of sport (oh, c'mon, you don't seriously think that all female athletes wear thongs, do you? Most "sporty" girls underpants are NOT thongs or really low cut.)
D) they just like them and don't care what others think.
Also called grannie panties, granny underwear, etc.
-"Ew, you wear granny panties?"
-"Yeah, that's right, I do. Get over it. At least they don't go up my a** like thongs."
Most people frown upon them because, as we all know, the smaller your undies are, the cooler you are. But in terms of comfort and practicality they beat thongs by a mile or more.
However, due to changing fashions, including the popularization of midriff exposure and post-sexual revolution distaste for too many strappy accoutrements, such as garters and slips, granny panties have stopped being associated with classy babes, and are now usually only associated with gross old ladies.
"Um, you know I love you and everything, but why is it your fantasy to dress me up like your grandma?"
"Ew, no! You're supposed to be Lauren Bacall in 'To Have and Have Not'!"
"you're right, granny panties can hold a lot more crunchy money!"