Below is a photo of R' Elio Toaff ז”ל with HH Pope John Paul II. In it, we see R' Toaff wearing a hat traditionally used in certain Ashkenazi and Italki communities, which many Jekkisch chazzanim, such as R' Ezra Lasdun of Breuer's maintain.
Where could one (especially a chazzan or rav) purchase a hat of this type?