No matter how creative the rash guards get, I think the classic standard, (black?) 10th Planet rashguard should always be available. Same goes for the t=shirt. You should always be able to buy a simple white tee with the blue 10th Planet logo.
That was the only thing that kind of got to me in the Eddie / Royler rematch. I liked how Royler was wearing the plain, simple original Gracie Academy logo on his rashguard. I think it would have been cool if Eddie had been wearing just a simple 10th Planet logo rashguard, rather than a more modern creative interpretation of the logo/rashguard.