Van, were you offering your seamstress services?
Clifford, Ikea was a good lead. They did have something that would appear to work, but they did not list the dimensions on the website and were difficult to get information from. They also had very limited color choice. However, that got me pointed in the right direction. For anyone needing a similar item, I ended up ordering a skirted futon slipcover from Slipcovershop.com. They claim that people have used this with success on jackknife sofas. Thanks for the help.