. "skullcap" . . "cardinal's biretta" . "Biretta" . . "square cap" . . . . . . . . . . "doctoral biretta" . . "birette" . "birretes" . . . . . . . "Biretta" . "red biretta" . . . . . "bishop's hat" . . . "biretta" . . "academic biretta" . . . .