I think it is fine if you really love it. It is not a big deal. Just go.
If it's her wedding dress, then it *is* a bridal dress, no matter what color it is. Ask her where she got it and buy something similar if you love the look, but don't expect her to loan out something that important and symbolic for a high school dance.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.