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