I know Halloween is a while away but heres an idea on how to make your own Skeleton Costume it would probably be quite expensive but it would be as close to the ones in the movie as you could get if you did it properly.
First you would have to get 2 body suits from here
1 black one with white hood and just a plain white one that you could draw the shapes of the bones on and then cut them out and attach them to the black one.
I think this would work quite well and look pretty good if you took your time.