This Bruno Mars photo contains
business suit, fedora, felt hat, homburg, stetson, trilby, boater, leghorn, panama, panama hat, sailor, skimmer, and straw hat.
There might also be
street, city scene, urban setting, dress hat, high hat, opera hat, silk hat, stovepipe, top hat, topper, beaver, well dressed person, suit, pants suit, and pantsuit.