"Nice job Chris! Unfortunately, we probably wouldn't be the guys to help you. It would have to be the Marvel's and DC's of the world approving this artwork to get anything done. We will pass your designs on to some of our manufacturers though just in case."
Dude you could call Marvel and sell them these Designs for a pritty penny man, i know someone who designed one shirt for Marvel and they paid him over 15 grand! just think how much you could make with all these!
Believe me, I've tried. I don't know if companies have a policy about answering small-time dudes like me, or if my messages just get lost in the sea of emails, but I've never gotten a response from any of them.
Keep at it dude. I'm sure you'll definitely get someone. And I'll be one of the first in line for them. Plus these things beat any of those "costume-shirts/hoodies" especially the ones with a hoodie mask. Good luck dude, I'll even keep an eye out for anyone I know who would know a thing or two about establishing a clothing line.