strange seat covers

Hey everybody, I just bought a 68 slant six automatic cuda, 63,000 original miles on it, still runs and shifts perfectly I have questions about the seat covers and dash. the seat covers are a soft suede like material similar to a modern microfiber. are they original? I've never seen anything like these before and cant find info online, everything shown online is vinyl or a coarser cloth. The buckets are lightly worn but the rears are damn near perfect, partial build sheet was under the bottom rear seat. no foam flakes or dried foam crumbs falling out, the dash and doors are Catawba green, Catawba ish seat covers.
thanks