There are areas of the country like here in Seattle that don’t get enough sun.
So what we need is a bra that has an eletromechanical charger inside. Like the old wristwatches that would wind up just by the motion of the wearer.
So here we could utilize the bounce.
That, of course, means we would get a way better charge the more they bounce, so natural resonators need to be built in.
Now in Portland, with all the aging hippies, the bounce wouldn’t work. But they could probably do something with the swing approach.