I've got an invitation to a halloween party and we are asked to wear halloween costumes. The problem is, I don't have such a costume. So now I need ideas how to dress up in a Halloween way without going out for shopping a new costume. I don't think I'll join another halloween party within the next few years, so buying a costume would be an overkill in my view. That's why I hope to get a halloween costume made out of the usual clothes one has or with only a few things to buy/add/change. Can you help me?