From his press conference today:

Whether it's a free country or not, you should be free to act as you want to do as long as it's not violent. No matter what it is. I came here in a Cookie Monster shirt because I wanted to, and I was going to wear the pants. But I thought you guys were going to judge me. I was going to wear the hat too. But I thought you guys would judge me. I didn't want Mitch [Kupchak] to judge me. So that's why I didn't wear the hats and the pants. But I should've wore it. You should be free to do and act how you want to act.