Well, in regard to refrense pictures, it's not so much looking for pictures from different angles, as pictures which highlight different things. Like, one that's a full body and shows the whole thing at a glance, then a few zoomed in pictures (probably from different angles) which show what the shoes, trim, accessories, and so on, look like. Then, once you have an idea of what the costume looks like, go to a sewing store and try and find a pattern that's as close to it as possible. Then start making changes to the pattern as needed. How much sewing experience do you have?