This Prinzessin Diana foto contains
filzhut, homburg, stetson, trilby, fedora, stetson trilby, boater, leghorn, panama, panamahut, seemann, skimmer, hut stroh, bootsfahrer, bein, strohhut, livorno, panama-hut, and sombrero.
There might also be
kavalier hut, schlapphut, slouch hut, and kavalier hut schlapphut.