Nothing says "I like Bill Cosby" more than wearing a hoodie that has his noggin on it (Although I'm pretty sure that wearing a Cosby sweater is probably an equally definitive statement ).
Now, if you happen to find Bill a bit trite (which makes you a complete asshole) don't worry, the folks at Head Hoods have some other famous people whose visage can grace your head and make you seem ironic (which will all know is a look that Starbucks customers enjoy imparting to the world).
Such as 70s/80s model, musician and James Bond girl Grace Jones:
Which is so super cool that I have started to desire it in a way that is very uncomfortable.
After the break are a few more skull-infused hoodies that will have your inner-fashionista clamoring to break out of your body.
And I warn you now, the Johnny Cash one will cause you to experience a need to kill. That's how awesome it is.
