The costumes we wore were kinda heavy and black(of course). Which didn't go well in the Florida heat and humidity of September very well. You might want to take that into consideration.

Also, even though the party doesn't start until 7pm(I think), you can get in as early as 4pm. We got there around 4:30pm, got our party wristband and put our costumes into a locker(which is free on party nights). We went straight to Tomorrowland, then Fantasyland. By the time we came out of Mickey's Philharmagic, around 6pm, they were closing down Fantasyland to prepare for the party. They hustled everyone with a wristband over to Liberty Square, and everyone else was escorted to the exit. We then put on our costumes and partied. The best thing about showing up so early, is that all the rides were walk on. There was no wait whatsoever. We rode more rides in that 1 1/2 hours, then we do in a full regular day at the park.