From YahooNews: 

T-shirt turns air guitar into music

CANBERRA, Australia - Scientists announced Monday that they have developed a high-tech T-shirt that turns the strumming of an air guitar into music.

The T-shirt has motion sensors built into its elbows that pick up the wearer’s arm motions and relay them wirelessly to a computer which interprets them as guitar riffs, said Richard Helmer, an engineer who leads the research team from the government’s Australian Commonwealth Scientific and Industrial Research Organization.

One arm is interpreted as picking chords while the other strums. The “wearable instrument shirt” is adaptable to both right and left-handed would-be rock stars.

(more here)