I'm sewing a Handkerchief with tow different fabrics Both 100% cotton. One fabric with a design, on one side and Flannel on the other side. should I use "Feather weight interfacing" ( non woven) in-between the fabrics ? Will the interfacing keep the fabrics from shifting away from each other after the Handkerchief is washed or do I need to run stitching across the fabric to keep them together ? Thank you.
