This Downton Abbey photo contains
fedora, felt hat, homburg, stetson, trilby, snap brim hat, boater, leghorn, panama, panama hat, sailor, skimmer, and straw hat.
There might also be
dress hat, high hat, opera hat, silk hat, stovepipe, top hat, topper, beaver, pith hat, pith helmet, sun helmet, topee, and topi.
I thought these Downton Abbey spoofs were absoultely hilarious. I had look and they didn't appear to be uploaded on this spot. Sorry if they are a repeat. video credit: BBC