Let me just start by saying this.....you cannot return a damn thing anymore without a receipt. Well unless of course you are lucky enough to have shopped at Nordstrom's and that little sticker thingy is still on the tag which you haven't yet clipped of course....then I guess the no receipt thing really isn't a problem. However, for the rest of the gazillion stores out there....this tip is very relevant and very important.
My philosophy on this one is simple if you haven't at least worn, returned or given as a gift every item on your receipt or your return period has not expired (another major annoyance), you should keep it. Just shove it into a clearly marked envelope or box and leave it there. Seriously, I can think of nothing worse than wanting to return something and being unable to because you can't come up with the receipt. Please note....this would never happen to a Savvie.