I just finished this dress, it was a custom order from my Etsy shop, Morningstar84 i drafted the pattern and made it as close to the dress in the images as possible.
I used new cotton polka-dot fabric lined in white cotton. Pin tucks down the center panel of the skirt with gathers across the hip. The straps and front X are all one piece and are interfaced.
Boning support in the side seams, back zipper. The skirt hem flares out just a little since it has no back slit for walking.
I really love how this dress came out!