This is done by using the left hand to pull the fabric firmly back near the edge of the outer curve(this causes the edge to frill slightly), while the right hand pull the lower edge of the curve around to follow the shape of the under section.

• 做法是用左手拉住面料,使之紧靠着突出部位的边(这使得边有点皱),同时用右手沿着下裁片的形状拉住弯曲部位的底边旋转。