Sentence:  Gregory sent Augustine a special liturgical stole, the <WSD>"pallium</WSD>", a piece of official ecclesiastical dress borrowed from the garments worn by imperial officials. 
Meaning of the word marked with <WSD> tags:  A woolen liturgical vestment resembling a collar and worn over the chasuble in the Western Christian liturgical tradition, conferred on archbishops by the Pope, equivalent to the Eastern Christian omophorion. (from 11th c.)