look on ebay under zentai. they have skin tight suits that come in shiny fabric. they are perfect for what you want and they are about $35 each. I use them all the time and airbrush detail onto them.
Yes, they are fetish suits but they work great for all kinds of costumes. Put in green a and shiny along with it and see what you get.
When you order them put in the features you would like. I always get a crotch zipper (the first costume was very hard to use the restroom in) and an open face/detachable hood. you will need no hood for super hero costumes.
Just a thought but worth checking out for what you are doing.