This Max D. Thieriot photo contains
fedora, felt hat, homburg, stetson, trilby, boater, leghorn, panama, panama hat, sailor, skimmer, straw hat, and campaign hat.
There might also be
porkpie, porkpie hat, dress hat, high hat, opera hat, silk hat, stovepipe, top hat, topper, beaver, beaver, and castor.