Once you have your materials, the next step is to measure and cut the fabric. Decide on the size of your Christmas dinner mats; a common size is around 12 by 18 inches, but you can adjust this based on your table settings. Using a ruler, mark the dimensions on the fabric and cut out the pieces carefully. It’s important to ensure that all mats are cut to the same size for a uniform look. If you want to add a backing to your mats for extra durability, cut a second piece of fabric in the same dimensions.