heidi, The way its been explained to me... Way, waaay back in the day before bathing daily was the norm, folks protected their expensive outerwear by wearing something less expensive underneath it, thereby soiling the underwear instead of their outer...
Wet Outfitters,Charlotte Russe! =)
Bogner, Obermeyer, Spyder, Nils, Metropolis, Columbia. I'm sure there are more but those are the ones I can think of off the top of my head.