The gathering foot can be used to gather individual fabric layers evenly. Using the foot notch, it be used to sew the gathered fabric directly onto flat sections of fabric. This saves time and gives your sewing project a special accent. The gathering foot feeds the fabric through unevenly because its sole does not sit level on the feeder. This creates an attractive ruffle effect when sewing. The ruffle effect varies depending on the thread tension: the higher the tension, the tighter the ruffle effect.