Some great advice in this thread so far Zenith young man.

All I'll add is this:

Your ex sounds like one of those girls that's commonly referred to as a cnut. There's plenty of them about. Most of us have had involvement with someone like that at some point in our lives. However there's plenty of good women out there so don't let one cnut cloud your judgement when a good one comes along. Learn from what's happened in the past but don't let it dictate your future.

As for the rest of her clothes, personally I'd jizz on every single article to give her the only reminder of you that she deserves.

P.s one last thing - at least you never married or had kids with the duplicitous cnut.