IN the history of quilts woman and whomever have used anything and everything. A lot depends on what you are going to do with the finished product. For ultimate wear, tear and beauty 100% cotton seems to do the trick. For decorative peices to hang on the wall or just display the sky is the limit. Consider the needs of the person who will be using the quilt. To sleep or cuddle under I like the feel and drape of good quality cotton. As a handquilter I love working with it. For a picnic or other utility item like a throw for the backseat of the car or a place for children to play on the floor use something sturdy like cordaroy or even double knit. I like to put cotton flannel on the back of lap throws or items a child will make their blankies.
It is all a matter of personal taste and what fabric you fall in love with. Enjoy!