thrift shopping

So I'm a college student age 20 and am recently on this whole discovering what I stand for phase. I've started to adopt this thrifting lifestyle, which I am loving because vintage clothes are always in style but being down to my last good bra, I began to wonder if bralettes, or no wire bras at a thrift shore would be a great way to save money, find quality item for a kicking price... but there is that thought of eww? what do you ladies think? underwear will forever and always be a no lol