I remember my first quilt teacher saying "don't just stick to craft fabrics, check out other fabrics as well". Also recall Mary Ellen Hopkins saying you can use whatever you want provided you are prepared to take the time to make it suitable for your quilt. She referred to a "wibbly wobbly" fabric (her words) she loved to use but it had to be stabilized first.
I know there are quilters who look down their noses at anything that isn't from the LQS but if they think of early American quilting they will remember the ladies used whatever was available for everyday quilts. I make my quilts to be used and even worn out. If one wears out from being loved I'll gladly make another for that person. Mistreat a quilt I've given and you are not likely to get another.
Following on what Joellyn said:- We all have our own opinions.