This Michael Jackson foto contains
filzhut, homburg, stetson, trilby, fedora, stetson trilby, kampagne hut, kampagnenhut, porkpie, and porkpie hut.
There might also be
markröhre hut, helm, tropenhelm, topee, topi, pith hut, pith helm, sonnenhelm, mark, hut, sonne helm, and sombrero.