I’m in favor of modesty, and there’s nothing like a scarf to disguise the fact that you really needed a hair cut three months ago.
However, wearing something on your head is obviously going to influence a game of soccer. If it’s not a safety issue, there’s the question of whether padding on the head is an unfair advantage in a game that involves hitting the ball with the head.
Ringers or ejected star players who change jersey number with a bench player at halftime could be used.