All depends on what you want to use it for and how much you want to spend. Good quality custom fit in garage storage or general fit outdoor weather/ sun protection? Or somewhere in between.
I have used tan cotton flannel covers for in garage covering for many years, so I can only speak to that. I did some searching and found a very high quality custom fit tan cotton flannel cover at www.carcoverusa.com/ which sells Covercraft who was the top brand years ago and I had long thought went out of business, so maybe they were bought out. Anyway I was so impressed with the quality I ended up buying a second from them for another car I have. Not cheap, but as they say, you get what you pay for.
My 2 cents Best of luck! PM if you have questions