I wouldn't use this for clothing, but if you make toys (amigurumi especially), this stuff is great!  Amigurumi is meant to be worked tight, using a C hook and WW yarn will do that for you.  It gives you a nice stiff toy that hides stuffing well.  A little goes a long way as well because you are using a smaller than recommended hook.  As I said, it's not perfect for every project, but for toys, it's the best!