if you want a wipe-able fabric you could cover the material with a plastic vinyl (there are different weights) and then there is flannel backed fabric (not sure of the same) but have used to cover out-door furniture....When I was a child I use to use that fabric/flannel backed plastic type fabric for something called a "sit-upon" from Girl Scouts...I think it is table cloth material/fabric....the other Item I have used was shower curtain lining that you could get inexpensively...I always put a soft fabric on the back, and make them attractive in pretty colors...
hope it helps.