Holy cow... it's pretty but thats going to be hella lotta work.
My thoughts: The skirt looks simplest to start with as it's just ruffles. I would reccomend a back zipper to hold that all together, you could even go with an exposed zipper as it would go with the look. The hip...er...bustles could be sewn onto the ruffle skirt. I would suggest bunching some tulle beneath themto give them volume, unless you want to play around with wiring.
The top; It looks to me like it could be acomplished through a vneck top with a corset style torso, so you would sew the top and then sew a corset onto it for the pieced look.
I would suggest starting with a premade belt from Charming Charlie or somewhere like it, because that's going to be the difficult part. The top seems like a simple tube, perhaps with some darts for shaping the bust and buttons added as a design element, not as part of construction. I agree with Cookie on the skirt though.