In the 1860's, Dr. John Ellis of Binghamton created a product that would become one of the most well known brands in American history and still is to this day.
There's not too much that's more embarrassing in the summer than wearing a nice shirt and having perfectly located sweat marks under each boob.
I always carry a towel with me and try to discreetly try to wipe the sweat from under my boobs, but that doesn't always work...