I finished Audrey's costume! I found out how to make this costume from this site. I would definitely go to that site for the step by step instructions. She explains it a lot better than me...trust me! But because I already have the pictures posted I am going to just tell you how I did it. I just suggest if you want more detailed instructions, to go to that site because I forgot to take pictures of some of the steps! Sorry.
I took a plain white sheet and folded it over itself twice so that you end up having 4 pieces when you cut out your pattern. I used one of Audrey's dresses to use as a pattern.