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