a cassock is a gown worn by priests, deacons and often by the choir during church services.
A black cassock with scarlet piping is a street cassock for a Cardinal, while his choir cassock (the one he wears for Mass and services) is scarlet colored.
SOUTANE
What is the long robe of black silk or other material also cassock?noun: soutane 1. a long cassock with buttons down the front; worn by Roman Catholic priests
Cassock
no the cassock goes under the chasuble
A Catholic Archbishop wears exactly the same thing as a Bishop, his house/street cassock would be black with purple piping and his choir cassock would be purple. His zucchetto would be purple as well.
They wear Vestments while conducting the Divine Liturgy and the Sacraments.
That depends on what they're doing. A priest normally wears a cassock or a black suit with clerical collar for his street wear. In church he would normally wear a cassock and a surplice. For some liturgical functions, he wears a stole and cope, for others, just a stole over his cassock and surplice. For Mass, he wears an alb over his cassock, with a stole, maniple, and cincture. Over all of that, he puts on a chasuble. His stole, maniple (if he is wearing one) and chasuble are all the color of the day, or sacrament that he is celebrating.
cassock
CASSOCK
A priest's gown is commonly referred to as a "cassock." This long, robe-like garment is typically black, although it can come in various colors depending on the liturgical season or the specific denomination. Priests may wear a cassock underneath other liturgical garments, such as a chasuble, during services.
blackcoat, dress, frock