All yarns are single ply unless twisted with another yarn. Terms used are two ply if two yarns are twisted together and three-ply if three are twisted. Plied yarns are used to make yarns stronger. In the jeanswear industry, it has become important to ply yarns in a piece dyed fabrics that are intended to endure a long stone wash cycle.
ECO-FASHION-DENIM AND DIAGRAMS DICTIONARIES OVERVIEW