Technology is wonderful and often incredibly useful. Othertimes it's just fine to use it to make cool stuff though. This is one of those times. These t-shirts, actually change their pattern depending on various things. The one pictured is a music equaliser that reacts to the volume of the music as a normal equaliser bar would.
Another picks up wi-fi signals in the area and changes its display as to the strength of that signal. Pretty groovy and just shows what the humble T-shirt can be used for with a little imagination.
So come on. What other technological innovations could a t-shirt use?