This Ian Somerhalder fan art contains
fedora, felt hat, homburg, stetson, trilby, campaign hat, boater, leghorn, panama, panama hat, sailor, skimmer, and straw hat.
There might also be
porkpie, porkpie hat, snap brim hat, dress hat, high hat, opera hat, silk hat, stovepipe, top hat, topper, and beaver.