We bought shade cloth and made a completely new, custom-sized skirt after the original skirt for our Protect-A-Tow got several tears in it. We reused all the original hardware. We got the shade cloth from a place in Florida that sold remnants very inexpensively, so the whole thing only cost less than $20 or $30, including new bungee cord. Even though the material is thick, a standard sewing machine should have no problem sewing it because it is so porous.
If you click on this link to our blog
, the entry for March 25, 2009 will describe how we made the new skirt.