Sewing DaySeptember is National Sewing Month, and today on "Martha," you're going to learn all about sewing! Fashion expert Tim Gunn is back to give Martha the inside scoop on his new show, "Tim Gunn's Guide to Style," and to reveal a trade secret for designing stunning clothes. And, artist Julie Dunbar joins Martha to show how simple embroidery can transform a plain T-shirt into a fashion statement. Then, go behind the scenes to see some of the sewing projects Martha is working on now, and get a lesson in choosing the right sewing machine for you.