Fascia (vestment)

The fascia is a sash worn by clerics and seminarians with the cassock in the Roman Catholic Church and in the Anglican Church. It is not worn as a belt but is placed above the waist between the navel and the breastbone (sternum). The ends that hang down are worn on the left side of the body and placed a little forward but not completely off the left hip.

The fascia is not a vestment, but is part of choir dress and is also used in more solemn everyday dress.

The pope's fascia is white. Only the pope may have his coat of arms placed on the ends of the fascia that hang down near or past the knees. The fascia worn by cardinals is scarlet-red watered silk. The fascia worn by nuncios within the territories assigned to them is purple watered silk. The fascia worn by patriarchs, archbishops, bishops, protonotaries apostolic, honorary prelates, and chaplains of His Holiness is plain (not watered) purple. The fascia worn by priests, deacons and seminarians is black, while the fascia worn by priests in the service of the Papal Household is black watered silk.

...
Wikipedia