Do mohair tonneau/covers exist? All the new/used ones seem to be leather/vinyl.
Talking about the cover for the hood and not a full tonneau.
I’ve seen a mohair one on a Marlin before and would prefer mohair rather than leather/vinyl.
NB
Thanks
Not seen any about but I guess if you really want one have one made.
Mohair/cloth typically, although not always associated with a glass rear window.
could be wrong but have a feeling that a tonneau cover only works with the flexible plastic rear window?
I have never seen a mohair part tonneau and suspect you may need to commission a custom fabrication. 
When I was looking for mine I did spot one on eBay for a Jasper Conran edition. That one was apparently Connolly leather and the seller was asking £150 at the time.
I bought a used black vinyl one for £15 
Good luck with your search and if you do find one I would be quite interested.
All the best,
Guy