I found this wonderful post:  http://thelavenderstudio.blogspot.com/2011/01/ceremonial-leia-dress.html after I finished mine, but the tips on the wings/overlays would have been really useful!  I ended up making my overlay of all one piece, but actually could have used two. For approval, I had to add a bit to the back edges of the wings, where they fell along the back of my arms. If you compare the shape of her wing picture to my pattern, I think you can see where I would have needed to add more fabric if you look at the "This section will go over your shoulder edge" area.

As usual, refer to the rebel legion standards:
http://www.forum.rebellegion.com/forum/viewtopic.php?t=8853

By Gerry Francisco