This Michael Jackson foto contains
filzhut, homburg, stetson, trilby, fedora, stetson trilby, boater, leghorn, panama, panamahut, seemann, skimmer, hut stroh, bootsfahrer, bein, strohhut, livorno, and panama-hut.
There might also be
porkpie, porkpie hut, kampagne hut, kampagnenhut, biber, rizinus, rolle, and castor.