Birretta (Noun)

A stiff cap with ridges across the crown; worn by Roman Catholic clergy.

Nouns denoting man-made objects.

The archbishop wore a distinctive red birretta as a symbol of his high office within the Catholic Church.
As a young seminarian, he was proud to don the traditional birretta and soutane of his order.
The birretta and biretta are often used interchangeably, but technically the biretta is the soft, unridged version worn by some clergy.
In the 16th century, the birretta was a common sight among Catholic priests and prelates.
As part of his vestments, the bishop wore a purple birretta adorned with a golden cross.