What seat cover material and some simple seat cover designs

[Olustee bus]

I would like some simple, sack like seat covers that I could have sewn together. I do not need to have the vinyl upholstery. I would like a type of material that would dry easily and stay cool.

I was thinking of having some "bag Like" covers made just for my fishing seats. I a may have some made for my couch and pilot bench.

Anyone have any ideas or examples?

[lakerunner]

If you or wife can sew and has a fairly new machine you coulds buy some light canvass and make your own.
My wife uses her sewing machine to make her own chair covers and some light upholstry.