This Katy Perry foto contains
fedora, vilten hoed, homburg, cowboyhoed, trilby, fedora met vilten hoed, and stetson.
There might also be
hip boot, thigh boot, schipper, leghorn, panama, hoed, zeeman, skimmer, strooien hoed, livorno, panama hoed, matroos, stro hoed, groene baret, speciale krachten, elite soldaat, and speciale troepen.