I made these from one yard of fabric from my stash, cut into fat quarters. They are quite large, I'll probably make them smaller next time.
They hold their shape well.
Starting with a cloth that has been prepared by sewing the edges (or cutting with pinking shears), grate some wax on a cheese grater. I used inexpensive paraffin wax from a salvage store, but if you're the kind of "crunchy" person who uses extra-virgin coconut oil to clean your bathroom, then you'll of course want to use local, organic beeswax. The fat quarters took a little over 2 ounces each.
Heat your oven to 200 degrees. Lay the cloth on a cookie sheet (I had to fold it.) Sprinkle half the grated wax over each layer.
Heat in oven until the wax has melted. Then, using a paintbrush you don't mind sacrificing, spread the wax to the edges. Re-fold (or turn over) and repeat.
Lay over a cooling rack (or two) to cool.
Hand-wash these with cool water. Don't microwave them of course. When the wax has worn off you can re-wax them, or just give them a hot wash and use them as cloth napkins.