We have a rule at our house, we make our own costumes with whatever we have on hand. I don't go out and buy them anymore. Halloween is about having fun and being creative.
This year I only had one kid that wanted to dress up and go trick or treating. Isaiah pondered for weeks on end what his costume would be this year. Finally the night before Halloween he decided to be a nerd. We dug through the goodwill bag searching for outgrown pants and shirts. A little decorating, an oversized calculator and an old pair of sunglasses with the lenses popped out and a little tape and viola...The Math Nerd.