Oh, lawdy, dream cosplays..?
Frederic Chopin from Trusty Bell/Eternal Sonata has been a long-term dream cosplay of mine. Others include Ledah/Malice from Riviera: The Promised Land, Xerxes Break (casual and/or Pandora Uniform), the Cheshire Cat (Pandora Hearts), and the Rail Tracer (not necessarily hard to complete by any means, its just going to take a lot for me to douse a beautiful white suit in red stain). There are more, but then it'd just get tedious! :p
I've got a lot of them, but recently, I decided that even though I dont have a ton of money, I'll just collect pieces of these dream cosplays over time, and eventually, I'll be able to put them all together.