Biretta while celebrating mass

In Paul Turner's Blog by Paul Turner

Q: Is it proper to wear a Beretta while celebrating mass, and while preaching from the ambo? Our pastor/administrator has started to wear a Beretta most of the time inside and outside of church. 

I was under the impression that it was to be worn in the procession to the altar then taken off until the procession out of church after the ‘go in peace’. And not worn all through the Mass.

I don’t know where to look for the protocol instructions. And I know you will have the answer.

Thanks for your response in advance.

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A: There is no provision for a priest to wear a biretta while celebrating Mass. It is not mentioned in any of the liturgical books.

Outside of Mass, priests’ clothing varies considerably.