Elastic is not just for pajama bottoms anymore. More and more fashionable garments are utilizing elastic in new ways that provide comfort and style. Do you know you can add elastic to a seam without creating a separate casing? By using an existing seam allowance, it makes it super easy to add elastic where you need it. In this tutorial, Professor Pincushion shows you the process in transforming a seam allowance into a casing and how to easily insert your elastic.