Okay, before you flip your shit, take into consideration the fact that this is probably not Superman’s ‘real’ costume. In Kevin Smith’s script (oh yeah, did I mention Kevin Smith wrote a Superman movie for Tim Burton to direct and Nic Cage to star in?), Superman is killed by Brainiac and then comes back to life - essentially a variation on the comic book Death of Superman storyline. In the script Supes was reanimated by the Kryptonian robot The Eradicator, and he came back powerless; eventually he donned a suit made from The Eradicator to get his powers back. While producer Jon Peters had wanted Superman in a black suit (as he had worn in the exact same situation in the comics), it looks to me like this is the Eradicator outfit.
Superman has had a long and tortured history when it comes to film and TV adaptations. If you’re interested in the most comprehensive look at that history, I strongly recommend Jake Rossen’s Superman vs Hollywood. Click here to get it on Amazon.