DeAngelo Williams, a running back with the Pittsburgh Steelers, lost his mom to breast cancer in 2014 at the age of 53. He requested permission to keep wearing the pink items when he plays beyond October to honor her memory. The NFL said no, that it violates very important regulations about proper attire worn when issuing and receiving concussions. Williams is working around this restriction by wearing pink dreadlocks and, more importantly, by picking up the tab for 53 mammograms.
Take that, arbitrary and stupid rules.