I'll buy a dozen if you manage to make the fabric as well.
And I will send thousands of adorable kittens, on the hour, every hour, if you manage to grow/produce your own fibre or at least make sure it is traceably sourced to groups that are not total bastards.
If you are going to hack t-shirts, you might as well do the entire chain. :)
edit - note: you are not allowed to source the fibre from the kittens just to get the kittens, that's cheating.
Each Kitton t-shirt is guaranteed to contain as a minimum, the fluff of 30 of the fluffiest kittens and we at Kitton are dedicated to acting sustainably, with full regard for the environment, all while keeping a close eye on the bottom line, at our unstaffed combined kitty processing plant and owl sanctuary.