sorting piles

One of the commonplace rules about emptying one's home is "If you haven't worn it/used it for [some period of time between six months and two years], give it away."  Arthur's follow-up to this is that if it turns out to have been necessary, you could buy another one.  I'm not sure I could buy another pair of brown, beige, and red argyle tights.  I'm wearing them now, because I can, but they are in fact a little tight, as one might expect from a garment I presumably bought twenty years ago.  The pile is a pile of old tights, part of the earlier go through old socks project that got stalled.