Thanks for replying Peggi, I may have made a mistake in using the word grain.
I fold the fabric salvage to salvage, adjust a bit right or left to get a nice straight hang, match my bottom fold to a line on my cutting mat, make my cut to have a straight edge to measure from. Ok, now my straight edge and the line of my pattern on the fabric are a 1/4 or better from each other on one end of the fabric but line up nicely on the other end.
I hope I explained it better!?!