I will pull a couple of threads, cut with scissors along the pulled line, then if the fold line is not straight to the weave of the fabric, I will stretch along both bias until I am satisfied. I have spent more than an hour getting a piece of fabric straighten up along the grain when it has been stretched and put on the bolt crooked. If patterns have straight lines in their designs that are printed off grain you've pretty well lost the game and might just as well give up getting cuts along the SOG. Use that pattern for a fussy cut.