Polyester is the synthetic fibre which is made up of repeating units of a chemical called an ester. Esters are the chemicals which give fruits their smell. Polycot, poly wool and terry cot are popular polyesters. These are made by mixing two types of fibres. For example, polycot is a mixture of polyester and cotton. Poly wool is a mixture of polyester and wool. Fabrics made from polyester does not get wrinkled easily. It remains crisp and easy to wash. Hence, it is suitable for making dress material.