1. Prewash and iron your fabric. Cut fabric into a square 1 inch larger than your desired finished size. The standard size for cloth napkins is 20 inches square, but there’s room for variation. After prewashing, my fabric was 40 inches wide, so I cut 20-inch squares, which made 19-inch napkins.
Tip: With napkins, it’s important to start with square, straight edges. So use a rotary cutter, ruler, and cutting mat when cutting your fabric.