Not sure of how much difference there is between the H22 and H23, but I just had new set of cushions made for my H23 a few months ago. They required 11 2/3 yards of fabric and 6 1/4 yards of vinyl for the bottoms of the cushions. Keep in mind that they had a computer controlled cutter and a cutting template that maximized the layout, so very little waste material remains after cutting out all the individual pieces.
Cheers,
Brad