It was funny.. either they put it in the pocket of the roller bag, or wore it ALL the time, even on the walkaround, hence the airbus nomming his hat.

When I was in newhire class, one of the guys played a joke on us and reminded us that we had to wear the hat even when we went to the lav in cruise.

That gave my OE captain a good laugh on my first trip when I donned the hat to go shake hands with the champ.