So I made mine first and gave it to both of them to try on, to see how much I would have to alter. Amazingly, it fitted both of them perfectly. I have no idea how but it did:)
The fabric is a duchess fabric which I love because it has a really nice drape to it and looks a quite glamorous. I did the draping with black lace which you can tie in front or back.
Here are the three dresses (The hem is not ironed in the pictures - that´s why it looks a little weird)
On the hem I sewed a small lace trim:
Here´s the back view:
And last but not least, a picture of the three of us all dressed up:)