Graphic T's and Hoodies. The game has a lot of artwork that would look good on apparel. (Front with a small EU logo and the back having the graphic.
Also, it would be nice to have a Tall selection for us larger gamers
I agree with others on the in game limited items being sold and having plushies/figurines for sale. I think there is a market that isn't being capitalized here.
I'd like a shirt that on the front says Entropia Universe and on the back says "Ask me anything, except that"
Or a shirt that says Entropia Universe on the front and the back says "I bought a stable in Entropia Universe and all I got back was this lousy T-Shirt"
Or a shirt that says Entropia Universe: We updated something, but I forget what it was so here's some vague patch notes