This is just a tutorial for sewing a wristlet, not a ith hoop like the one I think you are looking for...I remember the project just can't remember that one either. Perhaps if you can't find the correct one you can improvise.
If you can use one made on a regular sewing machine Tip Nuts has several .
These are also from Embroidery Garden but have the strap on them :) xXx
Is this what you were looking for?