Our pillowcase measures 18 x 18 inches, made of 100% cotton (633882). To start this project-iron the case, add a layer of Fabric Mod Podge to the whole area and allow to dry. (Place something inside the case to prevent the mod podge from leaking to the other side). Then begin adding the transfers you like to the cover. Once you have added the designs, apply another layer of the Fabric Mod Podge.