I am thinking about making my own T-shirt with iron ons. $5
Even though your intentions are good, even I know that your idea is great for all, but charging $5 a shirt is make you go broke. From an experience and professional artist, (airbrush artist) that T-shirts alone cost more than $5 each to purchase unless you buy packs of them. But it also what brand of shirts you purchase ex: Haynes, their quality is not all that great, it shrinks half the size the first time you wash it, I know, I've bought them and had that happen. Not if you buy something of better quality say like Jersey, then that would hold up to many washing's and will not shrink. I have an airbrushed T-shirt with the same design since 1996! And high quality T-shirts are going to cost you even more. On top of that, you other materials you will need, such as ink for printer, and the sheets to print on. So all in all, you've got about $20-$25 per shirt! Not to bring your idea down, I'm just laying down the reality of your idea. I could airbrush a T-shirt for $25-$30 each, pending on design chosen! I would absolutely love to have a TPS T-shirt myself to wear. Yes, wearing TPS logo T-shirts is free advertising for them, but they are not making any money off of it, because of copy write issues. You would definitely need the Permission from Pantera to do this!
But I'm all for advertising for Pantera and TPS in signatures on other gaming sites (if allowed) or youtube or any other social sites!
If anybody takes what I say wrong, I apologize now for it... I mean no harm!