The best advice on here is to look at the fabric you are buying. Don't be distracted by the color and print. Look at the weave and the thickness, feel the texture and notice how it drapes. Is it slightly stretchy or is it stiff and rigid? Compare different bolts by different makers if possible. After awhile you will start to get a feel for what is good and what isn't. You can find good and bad fabrics anywhere. Even my Walmart has some really nice bolts, and some I wouldn't use for anything!