The person who provided the information for the link below is cautious to declare that she's not a lawyer but she has attempted to digest some information she found regarding copyrighted fabrics and patterns as well. She provides the links from which she formed her opinions. I think overall what she's saying is that the use of copyrighted fabric for items to be sold is if-fy but seems to be defended. In one instance, the copyright holder simply agreed to be credited on a tag attached to the item. Regarding the use of patterns to make an item to be sold, it appears that you really should get permission from the pattern creator.
http://www.quiltingbusiness.com/quilting-copyright.htm