Pintuck is the name of this taffeta fabric. A pintuck is a fold of fabric that has been stitched to hold it in place, much like a pleat, in this case in shapes of two inch squares. Pintucks give a decorative effect to the fabric, creating a visual shape. They are often seen in vintage clothing, but they can be used to create a very modern looks as well. Pintuck is great for all types of clothing and is also used for tablecloths and event decor.