I poked around a bit but didn't see anything about German and Austrian traditional hat styles. Here is some of my collection. I would be interested in seeing others.
Bittner - Original Ischler Hut - Traunreiter
Zapf Collection Habsburg - Rotunde
Faustmann - Velour Oliv
Wegener - Graf Lemberg
Bittner - Austrian Straw - Bottlegreen