This Pirates of the Caribbean 4 photo contains
fedora, felt hat, homburg, stetson, trilby, pith hat, pith helmet, sun helmet, topee, topi, boater, leghorn, panama, panama hat, sailor, skimmer, and straw hat.
There might also be
dress hat, high hat, opera hat, silk hat, stovepipe, top hat, topper, beaver, campaign hat, green beret, special forces, and elite soldier.