Technical airbrush body paint: Airbrush paint to achieve uniform application and can achieve texture and effects. This is probably the best, for safety, flexibility, and speed. Although more expensive than the airbrush acrylics mentioned below, this is a better way to go as airbrush textile acrylics, tend to crack and peel at high flexion points. If you are working for a commercial client, doing a photo shoot, then these are what you want to use.
A long time manufacturer is Kryolan. High quality makeup from germany.
Dinair is another popular brand of Airbrush Makeup. They specialize in it, and also make standard skin colors Their focus seems to be more traditional glamour makeup, using airbrush technique.

Mehron has announced a of airbrush color. I've not had great success with Mehron in the past. The price is good, but I find it flakes and powders off easily when dry.
You may also want to experiment with Kryolan's Brandel color sprays in small cans. Unlike other hair colors, these lay down a solid opaque layer, just like real spray paint. It dries quickly to the touch and is fairly difficult to rub off. But in soap and water it dissolves quickly. It appears to be traditional hair spray loaded up with pigment. It has the same obnoxious fumes as old fashioned air sprays. I really like their gold and silver sprays, because it is possible to lay down a solid shiny layer. Black is incredibly messy though. Over spray is a real problem because of the fine aerosol mist these produce. Use a face mask! Seems to run US$6 to US$7 for a small can. It requires at least 5 cans for total body coverage. You can find them at good theatrical makeup supply stores. Here's one online source I found.