This Britney Spears foto contains
tukang perahu, leghorn, panama, panama hat, kelasi, skimmer, topi jerami, boater, shamsul iskandar, fedora, merasakan topi, homburg, stetson, trilby, hat dirasai, and stetson koln.
There might also be
porkpie, topi porkpie, and porkpie hat.