This Hatter and Alice fan art contains
fedora, felt hat, homburg, stetson, trilby, boater, leghorn, panama, panama hat, sailor, skimmer, straw hat, porkpie, and porkpie hat.
There might also be
sombrero, beaver, castor, dress hat, high hat, opera hat, silk hat, stovepipe, top hat, topper, and beaver.