They're known for their high quality displays and they already have a lot of the other technology that would be coupled with it - FaceTime, Siri, iCloud/iTunes, App store.
In fact, I think Siri and Facetime are both the key parts here. If you can get your TV to do things for you (eg book flights) and also use it as a simple communication point (FaceTime) - its in the realm of "future technology" that people think of when they imagine what's coming.
Smartphones are obviously wearable computers and they already exist.
Occasional fantasies of computers built into actual clothes are the domain of people who don't understand clothes very well.
Eventually every surface will turn in to an ad. And animated ads after that. The animated t-shirt can't be all that far into our future.