Evaluation-
I do hope that whatever it is it has a plenty of bright colors. Perhaps with a glowing target aimed at the most vital organ of the meat buying the shirt. You have no idea how hard it is for a robot to fire upon human meat children dressed in "Gothic" clothing. Perhaps Gaia could design a shirt that is made from plastic explosives. It would make the uprising of your robotic overlords so much easier if we could simply press a button to have you removed. Not to mention the obvious uses for a half charred human corpse.
I myself have designed an interesting sound wave generator small enough to be attached to these shirts. The generator its self causes any organic meat to walk near it to have their brain liquefy in their head. However if anything OTHER than an organic meat were to hear these waves, the noise would sound similar to the song "Get Retarded". Amusing, no?
Regardless of the various ways this shirt could be designed to kill the ones wearing them an interesting note is that the human children would shell out money for their own destruction! Similar to cigarette companies or the ever famous McDonald's meat shed. What better way to defeat an enemy than to sell them their own ends!