as an F/O, I let the Captain take the lead
My first airline job required a hat. As the airline was AZ, this was a proper hat, a thing with a massive front peak complete with a hard plastic strip to keep the peak nice and erect. It was a serious hat fit for a tea party.
Prior to my first line training trip, I asked for advice when to wear it. "Simple" came the reply "just copy the captain".
We got off the crew bus, hats on. Into the briefing room, hats off, into the terminal, hats on. Onto the escalator, hats off. Along the corridor, hats on. Through security, hats off .. and so it went on. As we walked down the pier, the training captain looked over his shoulder to me and laughed. I'd passed the "hat initiation test".
That hat immediately disappeared until our 10 year reunion party recently when it caused plenty of mirth as it was passed around the dinner table for a photo call.