I had some yellow leftover fabric from making the Snow White dress. There was enough to do the top but I had to buy more for the skirt. The pattern said 2.5 yards which I thought we bought that much. I guessed wrong, I needed to go get more.
I pinned the swag on the skirt at about 8" center back and each swag to the front was an inch higher, the center front was at 12". Now feel free to adjust to suit the height of the child. I top stitched each swag down in a swag shape from each pin, plus the fabric is gathered/folded at each swag.