It is worn over the alb during liturgical functions.
The most important liturgical function is the celebration of Mass, or the Eucharist.
Many had specific liturgical functions - processional crosses and altarpieces, for example.
They are also visible during other special liturgical functions such as the wake and burial of their bishop.
Stigand is performing a liturgical function, possibly not the crowning itself.
The horns once belonged on a bishop's dining table, but all the other objects have a liturgical function.
For liturgical functions other than the Mass the bishop typically wears the cope.
St. Peter's is famous as a place of pilgrimage, for its liturgical functions.
From this position the primicerius also derived certain powers in the direction of liturgical functions.
These art pieces often served a liturgical function, whether as chalices or even as church buildings themselves.