Hoodies aren't usually golf course attire, but don't tell that to Bill Belichick. He's playing in the Pebble Beach Pro-Am and, in the spirit of the event, has taken a casual approach to it all. That means the hoodie is on, and of course it's Pebble Beach themed.
Look at the Pats coach wandering off the green. Looks like he's just taking a stroll on the sidelines, sleeves rolled up and all.
Bill Murray was in a ghillie suit at one point, so there's that, as well.