That's too bad. Hope you didn't get hurt when it failed. Any idea what caused it? I don't know about sewing it. I once had an ENO single nest and did not like the way the seam felt under my shoulder. It might feel ok under you but I'd just make a new one. If you don't know what caused the failure and reuse the material, you may have another failure waiting to happen.
Don't let life get in the way of living.