I was given four plastic bags full of fabric, scraps and yardage. I was like a little kid at Christmas sorting thru all the fabric, ooohing and aahhing. There were only two pieces that weren't usable in a quilt. But there is a six inch pile of 10" squares that has me stumped. It is a beautiful red and black plaid woven fabric with a brushed finish almost like a flannel. But the weave is much looser. I am just not sure what it is....cotton?....wool? Is there a method I can use to identify what is in the fabric?