Here is how I made my faux wrap dress. Mine is a faux wrap dress, because I didn't want to worry about keeping things tied tight or putting a fastening on the inside.
Piece A is the front of the dress, piece B is the other part of the front of the dress. Piece C is the back. I attached both of the fronts to the back at the shoulders. Then in one fell swoop you sew up the side seems by sewing through the overlapped piece A and B as well as the ties so it looks like the picture below.
I hope this helps anyone wanting to do the faux wrap version.