The neckline was perfect and so was the shape of the skirt.. it DID need to be longer, but that would be easy.
I attached them the tulle to the bodice using a zig zag stitch along the neckline. I then finished the bodice by adding the facing, which also covered up the seam line where the tulle was attached.
I also inserted some thin flesh colored transparent ribbons between the front of the dress and the facing, to use as straps, since the strapless dress didn't want to stay up on it's own :
I would have preferred to attach the cape higher on the neckline, but the thinness of the tights made that impossible.
There was one other modification we made to the original is adding some snowflake buttons to the waist. The zig-zag edge felt a little 'mermaid' like and so we wanted to mask it a little: