The Palms has sponsored a player 2 out of the 3 years.
The WSOP will let players wear .net logos but will not let a player wear logo of another LV casino. I don't know about casinos from othe states.

Our player won the 7 card stud braclet in 2004.
They made him take his Palms golf shirt, logo on pocket, off when the final table started. He did get to wear it in the ESPN interview.