5The Aviator Hat
This was a necessary style for anyone in a cockpit. Especially in the beginning of manned flights, when the cockpits were still open, this hat made sure that all ears and heads were warm. When the jets took over, the aviators were replaced by helmets.
Similar to the aviator hat is the Ushanka, a Russian winter hat, where you can tie the ear flaps up to the crown of the hat.
This is a very informal variant of the hats. But it will ensure that your bald head stays completely warm. You can find more of these right here, prices between $25-$225.