This is one of the first costumes that I started making a lot of the pieces for myself, and I've "remade" it a bunch of times over the years. I'm still not 100% satisfied and am planning on doing a more embellished version of Tutu as my next competition piece!
I made the crown out of polymer clay, baked it, glued it to a barrette that sits in my wig. The headpiece is a half-moon shaped piece of felt that I attached a TON of feathers to using school glue. I made molds for the necklace gems using polymer clay and then cast them with resin. They're painted with shiny red nail polish and all of the gold detailing is actually 3D fabric paint. For the "wings" I patterned them out on paper first and then cut them out of some thin clear plastic and painted them with a very light layer of sparkly blue nail polish. The bodice is from Simplicity's "Black Swan" Halloween pattern, the plate and basque I patterned myself and are made of casa satin. The armbands are on their last legs so I'll need to remake them soon, but they're made out of satin and have elastics sewn into the tops and bottoms. For the panty I literally just used halloween store boyshorts but I'm planning on making a legit one when I compete with this next year. The tutu I bought from tutu.com (look for practice tutus if you're interested!) and added a couple of layers to it (and I'll be remaking it from scratch when I compete). For the wings, I took a coathanger and bent it into the shape I wanted, and wrapped yellow tulle around it, sewed on the three "tails" (literally iridescent ribbon with knots tied to the bottom), which attaches to the bodice via snaps (yay snaps!). I'm using an Inigo in Salmon from Arda Wigs.
Disclaimer: I took ballet for 13 years and did pointe for a year; I promise I am not in danger of breaking my ankles.