This image at first made me laugh a bit, then it made me think about its meaning. Could Che be wearing a shirt of himself as a display of arrogance. It doesn't seem so. It seems as though the message of this image is to convey the message that even the biggest revolutionaries of our time start out as idealistic kids. Simply kids that see how many things are just wrong in the world, and want to do something about it. Its a pleasant reminder to remember that no one is born what they become. At some point everyone is young, and has their hopes, their aspirations, and their role models. Even the biggest revolutionaries start out as kids that want no more than to make a positive difference in the world, and they might even rebel in petty ways such as wearing Che Guevara tee shirts.
Another possible meaning I got from this picture is that some things in society have transcended entirely their original purpose and have simply become meaningless symbols. Che was a great revolutionary, but his most famous achievement to most people is getting his face on millions of posters, tee shirts, and various consumer goods