I've never really been a fan of buying or wearing T-Shirts. When I DO buy t-shirts, I sometimes buy them from
shirt.woot because they're cheap ($12 and free shipping), nice designs, and good quality- so go with those standards if you're going to try to sell them. Darker shirts sell better, so I agree with the Black. If you've never heard of that shirt.woot site before, check out the
weekly derby and see what they put as their contest requirements and what wins / sells. You might even want to try your hand at the contest. It really gives you a good idea of what kinds of shirts sell, especially when text isn't allowed (or when text IS allowed, but a shirt without text still tells a good enough story to win).
You've mentioned before that you read
Strays, right? You should check out their
store and think about selling little trinkets like that instead. Maybe it's just me, but I'm much more likely to buy
stuff than
clothes. Also the owner of Strays' has a
Sugar Bunny Shop with more examples. They seem to avoid the T-shirt thing entirely, but they still have a very crowded storefront.
However, I'm not going to leave you with nothing about the topic at hand; t-shirt designs. When I
do buy a shirt, it must be either adorable, comical, or awesome. In your case, I'm thinking you could do something with some kind of tag line, but it would need something more than
justtext. Additionally, a logo-style design of some sort would be neat, assuming you went the "awesome" route. I don't really think your comic has anything for the "adorable" route unless you want to do put a chibi-kinsmir on a t-shirt. Give it some of those
chibi-anime-bat-wings and people might *squee* and buy it.
*shrug* I dunno. I just don't like T-shirts, but maybe that's just like me. I'm a sucker for *stuff* though. :3
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[Edit] Just a note- for the whole "Logo-style design," I didn't necessarily mean the Shifter's logo, but something in the style of art that logos are usually drawn in.
That Kinsmir design you made is a nice example, but would be nicer if it were placed on the BACK of a black shirt, over the shoulder-blades. For the sake of this "style"-- I know the shirt I'm using as my example is already being sold-- I would also recommend removing the gradient on the wolf's fur to make it a solid gray and match the solid-colored wings, or using a halftone effect of some sort. Your first version of this design was better with the less shading, but I would have liked to see it how without any gradients, matching the wings.