1960's Print Dress in a cotton screen print, I.Magnin labelWhat is 'flat lining and how is it sewn? Making vintage styles can be a new experience if you have only sewn crafts and easy modern fashions. One of the best ways to learn how-to sew dresses, especially vintage dresses, is to look at real examples. Trying to get the right effect usually means following the same, or similar sewing techniques along the way. In this post we'll look at 'flat lining' in fashion sewing.