White welding hat
The first time I learned that a solid white welding hat meant you were quitting was when I was a new foreman at the Marathon Oil Refinery. I asked a traveler from Texas to do a particular job and he just stared at me. He replied can't you see my white hat, I was looking confused so he told me he found another job in New York, and he didn't want to get his hat dirty. Realizing he was serious I wished him luck, turned to my apprentice an instructed him to do what the traveler would not. Get your white hat today.