"It's a little `America's Next Top Model' - without Tyra (Banks) - and a little `Teenage Mutant Ninja Turtles,"' says Marvel editor Charlie Beckerman.
The Gunn project evolved on a whim, but it turned out Gunn was a childhood comic fan and a good sport, Beckerman says.
Gunn says the experience has been "the most bizarre thing."
"It's exciting and exhilarating, but bizarre. When they came to me, I said, `I'm about to turn 56 years old. Are they crazy?' But it kept revealing itself in layers and next thing, I'm wearing the `Iron Man' suit. I was dumbstruck."
Personally, Gunn says he always fancied himself more of a Batman type, but he's pleased with the result.
"Most superheroes are fighting the same thing - good vs. evil - but who's taking on crimes against fashion? Me!"
The biggest offense, hands down: clothes that don't fit properly, Gunn says. And, if he had the truly incredible power to remove one item from closets all around the world, no question it would be Crocs.
"It's the No. 1 fashion crime item - and I see it a lot," Gunn says.