I don't want to get into wigs yet (this'll be my first time actually making the costume, not just piecing together already owned clothing), so my cosplays are centered on characters with long curly hair (because I can use copious amounts of colour-hairspray).
Tira Misu (both overcoat and battle outfit) - Sorcerer Hunters
Quon (first few episodes outfit) - RahXephon
Barry the Chopper (when in drag) - Fullmetal Alchemist
And possibly Kodachi Kuno from Ranma 1/2... 'Cause she's nutso.

But this one would be if I didn't get either Quon or Tira finished.