An enterprising person called Leah Buechley came up with an ingenious solution for cyclists or bikers: a jacket with turn signals on its back. She used the LilyPad wearable e-textile technology developed by herself, which is especially designed to have large connecting pads so that the LilyPads can be easily attached to clothes.

The jacket uses a LilyPad Arduino Mainboard and LEDs, and the signals are controlled through wrist-mounted switches.
According to comments on Buechley’s Flickr photo, there is already a patent for a similar type of clothing: High visibility safety garment.
You can find all the LilyPad products here.
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