So, we've talked about this a bit with yanme and the approach I like best is basically a series of black/grey t-shirts or hoodies with the standard WA logo (attached below, but it's in everyone's User\Import folder) at the top of the back side, then a variety of more unique designs on the front. Maybe some clever short comics using upscaled, vectorised sprites from the game, maybe one that's basically just the main WA menu floating in the dark, maybe clan and community logos if we have people who would be able to come up with stylish looking ones.
A pretty big issue with this, as it has always been, is that WA sprites, terrain textures/objects and other assets are tiny, not really suitable for print unless you can first vectorise them neatly, so that they still look good when enlarged to sizes of a few thousand pixels × a few thousand pixels. I know StepS has done some work in this direction for his HD frontend module, but I'm not sure how well his approach would translate to things as tiny as for example worm sprites in various poses. On the other hand, we do have access to
some of the sprites at larger sizes, and we might have more in the future (it's a thing Deadcode has been working toward for a long while).
The next issue is that from a legal standpoint, some of this is not totally okay, and Team17 would probably have to step in if anyone tried selling anything. But maybe just sharing the files in a thread here and having everyone order their stuff individually, on whatever website ships custom shirts to them, would be fine? It might be innocent enough, but obviously I don't know for sure.
Apart from that, it really just comes down to whether we have people in the community who can come up with clever ideas for this, and skilled artists who would be able to flesh those ideas out into art and logos that would look good enough to wear proudly. This thread gets the ball rolling on that, and if it happens, I can totally see myself ordering a shirt and a hoodie or whatever!