In an age of hipster irony and shirts to match, the Joy T-Shirt Project and its slogan, "Wear the World on Your Heart," seem impossibly sincere. But the "we're all connected" paradigm rings true: each shirt features the face of a real person—not Paris or Perez, but Sonya from Toronto or Sabry from Algeria, or one of over a hundred others in the online catalogue—hand-drawn and silk-screened over the wearer's heart. "It's more than just......