Ok this is what I would do if you want to give making it yourself a shoot. first make a jersey boatneck tshirt or buy one. Then I would put that on a dress form and drape the chiffon over it and pin and sew it to the shirt. For the chiffon sleves I would make tubes and sew them to the edge of the shirt then I would sequin it. For the skirt having made chiffon tutus I would get about 10-20 yards of chiffon or tulle and sew it it in gathered layers not in 1 gathered layer otherwise it will be to bulky but in at least 2 or three layers you then use a black linning that is not gathered stich the layers together and sew it to the top or you can put a waist on it and keep it seprate. I am making my prom dress in a simmilar style skirt but with a more fitted bodice.