I keep hearing about "quality" issues with Walmart purchased fabric. It's not just about thread count per inch. In some ways you can judge the quality of the fabric by sight and touch. At other times you find out after it's washed about colorfastness and preservatives or starches that were added to make it appear nicer than it really is. (positive or negative). One of the things I have noticed about some cheaper cottons are the density. You don't want to use fabric that is almost like gauze in a quilt usually.