This Bruno Mars foto contains
filzhut, homburg, stetson, trilby, fedora, stetson trilby, kampagne hut, kampagnenhut, porkpie, and porkpie hut.
There might also be
biber, rizinus, rolle, castor, snap randhut, schnappen sie randhut, snap krempe hut, boater, leghorn, panama, panamahut, seemann, skimmer, hut stroh, bootsfahrer, bein, strohhut, livorno, and panama-hut.