The Lightsuit is wearable el-wire extravagence made with Burning Man in mind, though it has been received quite well at several local cons. It has 21 lines of indepedently-addressable el-wire all controlled from an Arduino. It has several modes of operation, including one which reacts to the motion of the wearer thanks to an onboard accelerometer.
The el-wire is controlled using 3 copies of this 8-channel board, which is based on the one here and uses the same components.
Update: The interface card used in the Lightsuit is now available in kit form here!