The vestments worn by the priest when celebrating mass are then the most important.
In the Western Church, though from the 9th century onwards the Roman use had been the norm, considerable alterations continued to be made in the shape and decoration of the liturgical vestments.
In addition to the vestments shown in fig.
Before discussing the changes made in the various Reformed Churches, due to the doctrinal developments of the 16th century, we may therefore give here a list of the vestments now worn by the various orders of clergy in the Roman Catholic Church and the Oriental Churches.
The cassock, which must always be worn under the vestments, is not itself a liturgical garment.