I say shorts and tank tops xD
Vests are a different story. Think plain white frilly light tanks that you would never ever walk around in. That to me is a vest. I guess it counts as underwear. They get sold in sets with pants anyways (knickers to you? briefs? whatever xD)
And if I ever say hotpants I'm usually describing super teeny tiny really tight shorts.
Anyways the one that really annoys me is cookies. When I say cookie I want a nice cookie not a biscuit. Sheesh xD