people have been playing around with wearable computer elements.
That includes sensors placed in ones clothing that are connected to your friends cell phones. they call up your shirt (so to speak) and you can be sent a massage. or maybe your shirt lights up......the possibilities are endless.
it's also a good way to monitor a person with a medical condition. the sensors in the clothing can send messages to a friends cell phone. If the heart rate or temperature change, your cell phone immediatly notifies you.
it's a good way to keep track of granny while at work.
or something