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Covercraft Dustop has been good to me for 4 years, it has a little thickness to it and a flannel like inner surface.
FWIW I have the version for a 2014 Mustang but assume they are all similar.
I have used that one and it offer good outside protection but be careful if you live in a high humidity area as they don't breathe very well which promotes mold growth on the inside of your car during the summer months. My 68 has a lot of vinyl, plastic and carpet which the mold seemed to love a lot when left in a dark, damp (humidity) area created by this thick cover. If you have a de-humidifier in your garage it will keep the mold at bay.
Tim