I think most of us have pinned this DIY - and it is probably the easiest thing I have ever made! All you do it cut to slits in a square piece of fabric (jersey preferably) and voila! a cute wrap! I made one to the dimensions she suggested and it was too small - so I did this on a 45 x 45 piece instead.
I threw a belt on and headed to stitch N bitch, and got lots of compliments :)