BORDERS
The width on these do not have to be accurate because you will be trimming them down. But the length has to match the 9 patch. The bigger one will need to match the 9 patch plus a seam allowance on each end. The other two will need to be the exact size of the side of your 9 patch. So if your 9 patch varies a little cut the borders the same size as the 9 patch side.
Cut a swatch 2 15/16" x 2 1/4" ( don't panic just look at 3" and move the ruler back 1/16"). It isn't difficult. We'll call this one Border A
Sew the 1 1/2" by 2 15/16"
Cut two med swatches about 1 1/2" x 2 1/4"" These will be sewn to Border A
Cut the other two dk swatches 1 1/2" x 2 15/16" these I will call Border B
so now sew on both border Bs on opposite sides