Guess its time we got over the idea that only quilt shop fabric is to be used in quilts; that fabric that is somewhat less than perfect quality is ok to use; that the big box store fabric is ok to use; that yard sales and thrift store fabric is ok to use and older cothing makes good quits, What do you think the grandmothers used and I'm still using some on my bed In a lot of cases we are NOT making heirloom quilts and the one getting the quilt won't know the difference.......and YES poly/cotton or rayon/cotton is ok to use. We used such back in the 70's and the quilts are still good.