Underpants dilemma

When you live with somebody and occasionally wash together you don't want to appear like white trash by wearing trashy underwear. Mind you, that seems to apply only to women but since I am one I care about this. So today when I bought two new undies I decided it was time to throw some of the old ones away, both for the purpose of making space and throwing away what I don't use anyway. Only it didn't work. I held up an old pair and said to myself that they didn't look bad. Problem is can I give away used underware to the "more needy"? I really don't want to throw away a pair that is not trashed. And since I bought all these new fancy undies I know I won't use them again. What a dilemma! I need advice.