I made this dress (without the train in the back) and just left a back slit. It a very simple lined tube.
There's not much to say about this dress - it was very easy and it's simple line makes it good for a busy fabric.
I love this watercolor looking fabric, and it is has so many different designs in the cloth, I could get a new dress every time I cut one.
I paired it up with a very simple grosgrain ribbon belt that has a jewel sewn in the front and fastens with a snap in the back. The wrap is just a little remnant of cotton lace.