I just receieved my copy of the new book on Exotic Headgear of the Third Reich, Exotische. It is a large-format hardback book, approximately 9"x12" in size.
There are over 325 pages of headgear in the book, all in full color.
There are many in the way of personality hats, to include Hitler's; Dietrich's; Goring's; Wolff's, Ribbentrops, etc.
Not only are there visors, but there are M-43's, Schiffchen's; Kepis, Shako's and the like. There are at least 40 pages devoted to SS headgear alone. Heer, Luftwaffe and KM are well-represented, but as can be expected, are primarily General's/Admiral's or rare pipings.
There is an extensive survey of rare diplo/govt/state/political headgear, even some I had never seen before.