How about one of those pads they use for folks that are incontinent...they come in different sizes ,,, and are washable if you don't like the white or off white then cover it with your choice of fabric... they can be cut down to size.. Many older people use these in their recliners or lift chairs.. I think Walmart has them, most drugstores, or they can be ordered on line.. they are waterproof.... I like the idea of the flannel backed tablecloths too Marc's has them for $1.99 sometimes or stores like Big Lots or Ollies...