Twill and duck, also known as cotton duck, are two different types of fabrics. Fabrics are correlated based on weave, weight, color, texture, and the yarns used to weave them. Twill and duck differ from each other regarding these distinctions. Duck cloth is said to be durable cloth, as it has a square or simple weave, unlike twill, which has a diagonal weave. It is easily washed and is impervious to snags and damage.
On the contrary, twill is a thick fabric that is not durable like duck cloth. It is a dense and long-wearing fabric, and it is resistant to wear and tear. When you wear twill consistently, it becomes softer and fades with washing. Duck cloth is used for making tents, awnings, hats, and sails. The lightweight material is used in creating clothes like aprons and jackets, while twills are used for making slacks, jackets, overalls, uniforms, and many other clothing items. They are also used to create bedspreads, upholstery, and curtains.