Wearable air guitar shirt
Imagine you play air guitar wearing jeans and t-shirt – but you really produce music! That's whats possible since monday (but in a first easy application).
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
You can not really play a guitar because the t-shirt can not interpret riffs. But you can have a lot of fun by simply being loud 
Via T-shirt turns "air guitar" strumming into music
I think 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.