This Robin Williams foto contains
fedora, vilten hoed, homburg, cowboyhoed, trilby, fedora met vilten hoed, stetson, schipper, leghorn, panama, hoed, zeeman, skimmer, strooien hoed, livorno, panama hoed, matroos, and stro hoed.
There might also be
vierdeukenhoed, campagne hoed, porkpie, porkpie hat, porkpie hoed, and pak.