I have always been a prewasher. When I purchased the fabric for the last quilt I made, the quilt shop owner told me not to wash it. Instead she said to use color catcher when it was washed. It was a lot of fabric for a king sized quilt so I followed her advise. She said that good quality fabrics will not bleed. She was right .... no bleeding but when I washed the finished quilt the shrinkage factor kicked in. The quilt had the look of an old quilt and that was the look I was trying to get. So it was fine...... but, if I don't want that crinkly look, I'll prewash again.