Where can I find a good Nausicaa dress?

I'm being Nausicaa for Halloween and I basically need a long sleeved hooded blue dress. I'm 13 and usually wear a 12-14. For those of you who don't know, Nausicaa is an anime character who looks like this: http://images.google.com/images?q=nausicaa&oe=utf-8&rls=org.mozilla:en-US:official&client=firefox-a&um=1&ie=UTF-8&sa=N&hl=en&tab=wi This one would be perfect: http://www.amazon.com/Natalie-Rose-Sleeve-Hoodie-Chambray/dp/B0020LW2OY/ref=sr_1_5?ie=UTF8&qid=1256014520&sr=8-5-spell Great color, shape, and price...but its for a four year old. I will give best answer! Easy points if you're willing to research. Thanks soooo much I really need help.