The T-Shirts displays the CD-Cover of the song playing at the moment on your Ipod. There is also the possiblity to associate other artwork to certain artists or songs. Battery, screen and bluetooth-transceiver are directly enmeshed into the fibres of the t-shirt.
Argument: A lot of people buy a T-Shirt by their favourite bands, so there would be no need to buy such t-shirts anymore. The problem is the lack of cheap washable batteries and screens that could be integrated in the fibres of the t-shirt. Maybe the battery wouldn't have to be that powerful, because the picture on the t-shirt is quite static and only changes, when another song is played.