Factory woven (irregular twill weave weft faced) cloth. Fine black warp 2 colors of metalic thread in weft alternating.
https://trc-images.nl/collection_images/hires/2017/2017.0680_2.JPG#\\TRC-SERVER\TRCSharedWork\TRC Database\collection%20photographs\2017.0600\2017.0680_2.JPG#