Biretta
/bɪˈretə/
Definition 1 of 1
Pro Tip 1/3Clerical Attire
Understand that 'biretta' is specific to clergy wear and not a general fashion term. 
He took off his biretta before stepping outside.
Pro Tip 2/3Religious Significance
Recognize that the color of a biretta can indicate the clergy member's rank or the liturgical season. 
The cardinal's biretta is distinctively red.
Pro Tip 3/3Cultural Associations
Be aware that 'biretta' is strongly associated with Catholic and some Anglican traditions and not other religions. 
In our Anglican church, the priest sometimes wears a biretta.