I fixed it but not the way I wanted to. I did patch in a long piece and no one will be the wiser, but trying to join it one way I messed up again but at least had enough to join a different way. It looks fine and the stripes match, so I'm happy with it. Now to figure out the best way to sew it to the back. I've watched 3 youtube videos and they all use different stitches, so I guess it's personal preference. I can't believe it's almost done!