Spanish Birettas

John Paul Sonnen has a post on the Liturgical Arts Journal today about the distinctive, historic, and let’s face it, rather endearing, ecclesiastical headgear traditional for Spanish clergy, the Spanish biretta. The way the medieval pileus soft head covering evolved into the stiffened biretta in Spain was different from the rest of Europe, with four horns rather than the three ( four for academic distinctions) vanes that became normative elsewhere. 

The illustrated article can be seen at The Spanish "El Bonete Español" Biretta 

and even includes where to go to get such a biretta in Madrid.