|Yep - stupid me - this weekend I was finishing up a tablecloth, and like an *idiot* I cut off the seam allowance for the braid that will finish the bottom edge of the tablecloth. Fortunately, I was only about a yard into cutting before I realized my mistake.
So - to replace the seam allowance, I overlapped 2 inch wide Seams Great 1/4 inch over the cut edge, and did a tiny (2 wide x 1.5 high) zigzag stitch to attach it. Then I used a rotary cutter to cut the Seams Great to 1/2 inch from the cut edge. Thus I replaced my missing seam allowance. Seam Great is really sheer and you can see right through it, so it was easy to keep the tiny zigzag right along the cut edge of the fabric.
Of course I still had the problem of the cut edge butted right up against the braid, but I plan to cover that with flat braid, which will hide my mistake...and the double braid actually looks better too.