You can get a complete new wardrobe of clothes, all paid for, on the condition that you give up every single item of clothing you own in exchange. Would you do it?
My mum regularly used to say "oh I'd like to throw away everything and start again!" but I don't think I could. I have some things I really really like that I don't think I'd be able to buy now. Nothing terribly valuable, no designer gear, but some things I'd be sad to lose.
PS just pretend there's no issue with chucking clothes out, this isn't a "green" discussion