I prewash by soaking in hot water then rinsing well. Then I line dry and the fabric is wrinkle free. Perhaps it would shrink more in a hot dryer, but removing the sizing is what I understand creates the majority of shrinking. With my method there aren't wrinkles, I have removed the chemicals, and I have controlled dye bleeding. I do not starch and I do not have to iron. I dislike ironing immensely. Maybe it was because as a child, my job was to iron my father's white shirts. My husband's shirts are sent to the cleaners.