Fair enough, this is why i wanted to ask. I know that printed suit costume is only cheap, i think it's £45 on ebay but no point buying it if you think it won't work. I just thought it might work better than a plain undersuit where the gaps are, i might have to think of something else for the gaps.
I had a similar thought myself for my costume, had been looking at dark red undersuits, I did find an "Ironman" suit for running. It's a Ironman "running/exercise" suit but with shorts printed with Ironman suit on it. It's black and silver though.
Other idea is to find something with some sort of printed lines on it like wires or something similar. Probably going to settle on a Dark Red under suit and modify it.