This Dana Hamm photo contains
boater, leghorn, panama, panama hat, sailor, skimmer, straw hat, fedora, felt hat, homburg, stetson, trilby, and snap brim hat.
There might also be
swimsuit, swimwear, bathing suit, swimming costume, bathing costume, dress hat, high hat, opera hat, silk hat, stovepipe, top hat, topper, and beaver.