Starch adds a stiff/crispness to a fabric, making cutting easier, more precise. Sizing adds body to a fabric without stiffness. Fabrics on the bolt have sizing in them, it helps keep them from wrinkles. We tend to wash out the sizing when we prewash. Some people like to add it back to the fabric when ironing, helps with the wrinkles, does not add the stiffness of starch
Last edited by ckcowl; 10-11-2014 at 06:48 AM.