I'm going to go as a retro spaceman from the 50s.

I'm heavily basing my design off the suit from
Owl City's Alligator Sky music vid 'cause the design is perfect:

I have the materials and a rough idea on how to make the helmet, but I'm not sure how I'm going to do the suit. it all depends on how long it takes me to make the helmet assembly, plus I don't have any experience with sewing or faux leather. Might end up going with the cheap comic-book-looking suit in the first pic because i could easily just use a morph suit and some custom parts for that.