When you are embroidering a monogram on a napkin, first measure 3" from the corner of the napkin (opposite the label if there is one) and center your monogram at a 45 degree angle in that location. A size of 2.5" to 3" inches is appropriate for this use. To see how easily you can create and place monograms using Compositions project based embroidery design software you can view the demo at www.kenparsonsdesigns.com