High quality full-body spandex suits (custom cut if desired) are available from
http://www.costumeok.com.
Their low prices initially made me suspicious of their quality. Still, I ordered my Halloween costume from them and was very impressed. It took only 2 weeks from ordering a custom fit to receiving it all the way from China.
Their spandex isn't as stretchy as some, so if you give them absolutely correct measurements, you will get an absolutely perfectly skintight suit with no extra fabric wrinkles. I'll be ordering from them again.