In the scheme of things this will sound so very unimportant, but what the heck. Have pilots stop wearing hats?

Sitting around IAH this morning trying not to bore myself to death. I noticed pilots walking around without hats. This probably came about a long time ago. I must not be very observant (my wife will verify that!). So what is the deal, wear them if you want to? Most of the time in the past I remember pilots wearing them, or mostly carrying them, or clipped to their luggage. I do remember the lady pilots wearing a hat and a man's necktie. That must have been when there was a strict uniform polcy.

Just wondering - now we can return to business as usual