This is a Roman Cut Priest Stole and is made of Silk Fabric. The stole is fully embroidered with metallic gold yarns and lined with satin fabric from inside.
Stole is a liturgical vestment composed of a strip of material around four inches wide and usually seven and a half to nine feet long. It has either a uniform width throughout, or is somewhat narrower towards the middle, widening at the ends in the shape of a trapezium or spade. A small cross is generally sewed or embroidered on the stole at both ends and in the middle; the cross, however, is prescribed only for the middle, where the priest kisses the stole before putting it on. There are no express precepts concerning the material of the stole, but silk, or at least a half-silk fabric, is most appropriate. (source: www.newadvent.org)