but this one looks like it was designed by a real artist.
Well of course, here is where the suspension of disbelief comes in. Superman would have designed the costume himself, as indeed would have all superheroes, and with rare exception none of them are artists, let alone tailors.
I can believe a rough and tough he-man could cobble together the original costume...shirt, tights, trunks, cape. I can accept that Bruce Wayne made his first few costumes (putting more time into it than Clark because every element would be specially designed to reinforce the "fear and intimidation" motif) and that his more recent ones are the work of scientific know-how, a paid team of developers or both. But other heroes? Not so much. The worst being the movie Peter Parker, who despite being flat broke somehow constructs a costume it took thousands of dollars and all manner of hi-tech machinery to construct in real life.
Which is to say, I'm always torn in these matters between the desire to see a well-designed outfit and the nagging voice in the back of my head that says no reporter, beat cop, lab technician or soldier could ever have mustered the design sense, sewing skills or funds to make it himself. Seriously, what self-respecting man of action steps back from a tailor's dummy with needle and thread in hand and muses, "I don't know, maybe it needs a little yellow around the belt to bring it all together..." ?