AUGUSTINIAN CANONS, a religious order in the Roman Catholic Church, called also Austin Canons, Canons Regular, and in England Black Canons, because their cassock and mantle were black, though they wore a white surplice: elsewhere the colour of the habit varied considerably.
The custom of wearing the cassock under the vestments is traceable in England to about the year 1400.
In winter the cassock was often lined with furs varying in costliness with the rank of the wearer, and its colour also varied in the middle ages with his ecclesiastical or academic status.
The old form of English cassock was a double-breasted robe fastened at the shoulder and probably girdled.
SOUTANE, the French term adopted into English for a cassock especially used for the general daily dress worn by the secular Roman clergy in France, Italy, Spain and Portugal.