Article about: The textiles used look correct. Similar examples have been posted before and accepted as SS and original. To add a clarification, armbands on greatcoats did include the black borders. Regard
Such armbands are noteworthy for their greater length, as befits the larger sleeve of the overcoat, which was cut in a generous way for comfort. I own four over coats, all of which have arm bands of the conventional type, i.e. with black stripes.