Has anybody heard about Smart Fabrics?

I was looking to incorporate smart fabrics into a design idea: i.e. using LEDs and Sensors woven into fabrics. Can anybody tell me:
if this a myth?!
where I can get some detailed information as to what’s available/possible
What the costs might be…
and if I can get any samples from anywhere?
Thanks for your help

…nasa and the us military have been working on this for some time… try an american company, outlast technologies, for more info…