OK now that is awesome. :-) It doesn't appear to say anything about how you recharge the shirt, though. + bonus: if they make it so it only charges with aggressive movement, you might see a few more people walking and exercising. :-)
Why stop at the T-shirt recharging through your underpants could be interesting, and have the benefit of a cosmetic enhancement illusion. Why not a recharging hat? That could also have a photovoltaic panel on the top.