While we are on the subject...
I remember well a Mesa EMB CA in Charlotte several years ago. He had the interesting habit of never removing his hat... Ever. He may have slept in it. When assuming his position on the flight deck, he would put his David Clarks on right over that uniform hat WWII bomber pilot style. I am not one to mock a fashion statement, but I thought that might be a little over the top.
There is a US Airways guy in my crashpad who is much the same way. Blue uniform hat (which is now optional an looks goofy with the new "funeral director black" uniforms) that stays on his head HOURS post crashpad arrival. I have seen him sitting at the common computer sans uniform shirt, no shoes, uniform pants and still having that hat on his head. Maybe he forgets about it...