Originally Posted by
Peckish
Your reply confuses me. I'm not sure what you mean by "each half". If you piece the back diagonally, you will have one single seam running diagonally, for instance from the top left corner to the bottom right corner. There will be no seam running down the middle.
If you look VERY CAREFULLY at the directions for diagonal piecing, somewhere in the small print, it says if you use 44 in fabric, you can only make a back that is 150% of the width, which is 63 inches. So in this case, she would have to take each half and diagonal-piece it, or piece one diagonally and leave the other one plain.
Depending on whether or not the back is already cut to length, there are several things I would do. If it is already cut, one would be to pick out the seam, use the cut off fabric to make a strip for the middle, but somewhere along this strip, add a block (or two or three) that matches the front (or not. Maybe you have an orphan block that would work). That way it would look planned.