As mentioned, 'gameface' would be the clue to why I want the change. If I have to ''Just rejoin and change settings'' every time I want to change apparence it's not worth it anymore, then I usually end up allways playing without the hat/helmet.
I realise it's not an important change, but it might give people some feeling of control when they want the hat on or off.
If you deside to take off the hat, in what situation do you want it back on when you respawn?