The second image you have is a photoshopped version of the one that I have. http://img.photobucket.com/albums/v1...imebook-04.jpg
As I think these are costume designs for when they're much older (they look to be late teens in that pic), I don't know that there will be many images of the back of the outfit. I would just mirror the front for the back, as I doubt it would be that much different from the front.
I -think- the pic is from an artbook, but I'm not sure. A friend of mine linked me to it a few months ago, and I can't remember where she said it was from*sweatdrops*
I hope that helps.