Alright i finally have a plan for this costume. it will not be the original Yoko because of my size. *which isn't big* Im just not quite the right shape for her. So im altering the costume to suit me. I hope this turns out well! Wish me luck!
This costume is going to be almost exactally like her original but the top and bottoms will be a little bit different. I will be uploading photos as i go.

A blog post on how this was made http://catmargiotta.wordpress.com/2011/02/04/yoko-costume/