This Zac Efron vs Robert Pattinson photo contains
fedora, felt hat, homburg, stetson, trilby, boater, leghorn, panama, panama hat, sailor, skimmer, and straw hat.
There might also be
pith hat, pith helmet, sun helmet, topee, topi, dress hat, high hat, opera hat, silk hat, stovepipe, top hat, topper, beaver, hip boot, and thigh boot.