The main dress is in two peices, for now. I sewed them together with a 5/8 inch seam.
Then I removed the zipper from the muslin.
After basting the zipper in place I sewed it in place. Basting in place really helped get the zipper where I wanted it. I got it right the first time!
The seam at the waist is about 1/4 inch off, since everything else lines up and it will be covered with a sash or ribbon.