What is Crewel Embroidery? Crewel embroidery is a form of embroidery that traditionally uses 2-ply worsted wool yarn wool on natural, evenly woven fabric. This style of embroidery creates a textured, almost 3 dimensional look. According to Crewel Embroidery by Audrey A. Francini, “Although wool embroidery was worked in many European countries long ago and …