The moment I saw the trailer for Black Swan, I said: there's my halloween costume.
True to my word, I put this outfit together from mostly leftover things I've had over the years: the leotard was sewn together by my mother and I (originally for a Rocky Horror Picture Show costume... go figure.) thus why it's sparkle-y. The ballet shoes were as simple as black satin ribbon tied around bedroom slippers. Bam. DIY dream come true.
The makeup is not as hard to replicate as you may think.