From Smurfettes to Sponge Bob, there's no shortage of sexy Halloween costumes out there. But if the thought of yet another year freezing your butt off in some barely there rendition of a cartoon character or naughty fill-in-the-blank has you dreading the Oct. 31 frightfest, all hope is not lost. I've gathered together 20 of the least sexy Halloween costume ideas for all you nonconformist ladies out there. Ready to get all (not) hot and bothered? Click on!