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