My mother in law made a very small copy of my weddingdress, she made a christening gown out of it, very beautiful!
But that is not much help.....your granddaughters are way past christining age.....
The thread Buddy talks about had some very nice pictures in it, but I can't remember witch thread it was.
I hope the lady that posted those will read this and post them again....

I wish you luck, and don't forget to post pictures when you start working on it!!!!!!!