Ohhhh I can tell that's going to be a beauty.
Are the pieces 'large' enough where you can sew them back together in crumb block fashion for the backing? That way all will not be totally lost.
I hope you don't mind but I had to see what the entire skirt looked like and found this. Is it the one?
http://www.amazon.com/Christmas-Cele.../dp/B003GW3AGA