I'd like clothing that will recharge low-drain devices, like cell phones and mp3.
The fabric will be made of photosensitive material-- wearable solar panels. On the jacket, shoulders, hats, top of the shoes.
There can also be induction-coils in the shoes (much like you see in the shake flashlights).
The pockets will have plugs to plug in the devices (in this dream world, there's a universal charger for cell phones, ok?)
Basically, just by wearing the clothing and walking around will generate a small charge to recharge the devices.
Those who need more power and less fashion can wear a wind-powered generator in the form of a beanie. =)