Last time I lost weight I donated them, and regreted it when I gained weight back. Now I have a stash of old larger clothes, just in case....but I hope to donate them when there comes to be a big size difference (probably like 4 sizes or so)

I think some have already mentioned this, but I got rid of my old clothes by selling them through consignment shops. They donate whatever doesn't sell, and give you a receipt for your taxes. I used the money I made to buy new clothes...but I often shopped for them at the same places! I bought a lot of new ones at second-hand stores, too.

However, as much as I also espouse the "get rid of the big clothes" idea, I do recommend keeping one or two pieces from your highest weight. It's wonderful to try them on and see how much you've lost, plus it makes for a great before and after pic!

I either take them to a consignment shop and try to get a little cash for them, or I donate them. Just depends on how new they are and what season it is.