That's dansu to pansu o: and all of their outfits are made by itsrainingneon http://www.facebook.com/pages/Its-Ra...27178764017820
She actually takes commissions on them (but I think she has exams right now), and you can see her design process on her page. But yes it's a rave style. I make my own as well and like Aurora said, find a theme and design the outfit around it. I might start posting some of my con rave outfits on here since they're only seen at cons. Everything though starts with a theme or an idea and is planned first on paper c:
Easier to find me at facebook.com/EnvyCosplay <3
Magfest - Travelers (Journey)
Katsucon - Blake (RWBY), Nightmare Moon ballgown group, Shimapan-chan (night only), Sailor Megara, and Maid Stocking!