Repairing a sash

[Watson42]

I have a tartan sash, borrowed from my gran, and I've noticed that there is one edge which has the hem pulling away on two corners. How do I go about fixing this without losing any symmetry to the tartan?

Pictures, if that helps.

[Steve Ashton]

The best option would probably be to pull the warp threads out, up to where the damage ends and then purl the long yarns into a nice fringe.