This Lady Gaga screencap contains
Fedora, nadama sumbrero, Homburg, Stetson, trilby, porkpie, and porkpie sumbrero.
There might also be
boater, leghorn, panama, panama sumbrero, mandaragat, espumadera, dayami sumbrero, hat campaign, dress sumbrero, mataas na sumbrero, opera sumbrero, sutla sumbrero, pausukan, trumpo, trumpo, and beaver.