Lay one of your plates upside down on top of your fabric. Using a pencil or chalk, draw a circle about 1″ wider than the plate all the way around.
Cut out the fabric circle. You will need one circle for each plate.
Lay a plate upside down on a sheet of wax paper. Clean it well with glass cleaner and paper towels to remove any fingerprints from the glass, then paint a good, even coat of the Outdoor Mod Podge all over the back of the plate.
Place a fabric circle right-side-down on top of the plate and gently smooth it out to remove any creases. Using a squeegee or a credit card, gently rub the entire surface to remove any air bubbles and make sure everything is stuck tight to the glass.