I'm doing something similar to gnat's photo this year, I got little miss muffet from the spirit store:

http://www.spirithalloween.com/produ...-teen-costume/

It's really cute with the petticoat. Under that I've got bike capris and I think I'll wear pink/black striped knee highs as well. The large teen size actually fits me (its $20 less then the adult sizes)... and what's cool about these is they are not the cheap spandexy things that leg ave. has, instead this one is made of real fabric. They have a bunch of different versions.

The only thing I dont trust is the cheap zipper on the back so I'm getting some ribbon with grommets in it and sewing that in its place to make it a lace-up back.

this is a perfect length for wearing bike tights/shorts underneath, and it looks just too freakin cute! It's sexy but still mostly covered up. the petticoat is what makes it though, I tell you what!!!