Well I am not entirely sure but I have heard that this has already been implemented in some countries to become "Invisable" you might say. They're not exactly microscopic computers but they take millions of images from the front sides and back and displays it self on the opposite side. It's kind of like a mini computer? Or just a small step to something like it. But back to the question, what I think would happen if microscopic computers were integrated into clothes.. There would probably be a lot of hacking as you said and also sexual harrasment.. xD but for serious it would be a giant leap from the technology we have right now.