Just my 2 cents here. YMMV
I use a simple cotton cover, designed for the 914, that I bought 25 years ago! I use this because it's lightwieght and can easily go in the washer & dryer 4 times a year to rid itself of dust & all the other things that float around my garage (don't ask).
However, underneath the cover is layer of old flannel sheets (3) that had no further use in the house. They have been washed so many times that they are really soft. When I remove everything there is no hint of dust or abrasion.
My garage is my reading room, smoking chamber (I smoke a pipe) & private space. It's also my workshop. That's why the inexpensive cotton cover is the top piece - gets dusty, but is easily cleaned.
A few years back I gave serious thought to a flannel cover, but decided that I had a good system & the the flannel cover would overburden my washer when I wanted it clean.
That simple cotton cover IS starting to get a little thin, so I may need a new one soon. Maybe the new one will last another 25 years, at which time I'll be 89!