Balenciaga evening dress and cape from 1965 made of a thick silk fabric with a stiff finish, named Gazar, specially created for Balenciaga by the textile firm Abraham of Switzerland. V&A Museum :
Women's Cape Top in Black | Balenciaga US
Balenciaga 1959 Pink Satin Cape, White mink knot, Photo Philippe
Inside Demna Gvasalia's Revival of Balenciaga Couture | AnOther