Just like with good quality materials in everything else - like cooking, for example - better quality fabrics will be easier to work with and may make your hard work look better overall. That's not to say that less expensive materials don't have their place. For practicing, trying out a new technique, or when you don't really need it to last a lifetime. Just realize that the "hand" of a well-worn recycled shirt will not be the same as a piece of new, high quality fabric, so if it doesn't produce the same results, you'll know why.