I am so glad to hear this---I have bought books and patterns but never fabric.
One note---if you are ever unsure if a fabric is cotton there is a test you can do. Cut a 1 inch size piece from the fabric, put it in a glass ashtray and set fire to it. Cotton will turn to ashes but polyester will melt and form a hard substance. Any combo of the two will do something inbetween both. It works everytime. I know cause my DD won a ribbon at the Science Fair with it.