This FlyingDoctorsbigfan3 / Flying Doctors photo contains
snap brim hat, boater, leghorn, panama, panama hat, sailor, skimmer, straw hat, and sombrero.
There might also be
dress hat, high hat, opera hat, silk hat, stovepipe, top hat, topper, beaver, pith hat, pith helmet, sun helmet, topee, topi, horse wrangler, and wrangler.