I prewash, have for 50+ years and people say they wash used fabrics, news flash, you do not know where new fabric has been, container ships and oversease factories can be really bad. Also if I wash, I know if it will wrinkle up or ravel really bad, never mind bleed. But to each his own, and I do not starch until ready to use as here in FL bugs can be a problem and starch is like candy to them sometimes.