The use of the biretta has not been abolished as a result of changes in the regulation of clerical dress and vesture following the Second Vatican Council and still remains the correct liturgical headgear for those in Holy Orders whilst "in choir", but its use has been made optional. Its use is prevalent among bishops and cardinals, and less so among other clergy. Some priests wear it during outdoor services such as burials or processions and, as is intended, during the celebration of Mass and other liturgical services. The biretta is also worn by a priest, deacon, subdeacon, and bishop in attendance at a Mass offered according to the rubrics for the Roman Missal of 1962.