This Cereal Guy photo contains
fedora, felt hat, homburg, stetson, trilby, boater, leghorn, panama, panama hat, sailor, skimmer, straw hat, porkpie, and porkpie hat.
There might also be
campaign hat, dress hat, high hat, opera hat, silk hat, stovepipe, top hat, topper, beaver, sign, poster, text, and chalkboard.