Why do you need straight of grain? Are you cutting strips? Or are you cutting squares/rectangles? Depending on the fabric (Kona cottons are terrible for fraying if they are cut on the straight of grain) I will match the selvedge edges and not worry that the grain is not perfect. If the fabric has a specific print that reads up/down, I go with the print and forget about straight of grain completely.
If you need WOF strips, you can match the selvedge edges, but make sure that your ruler is absolutely perpendicular at the FOLD and cut your strips. You will have to trim the selvedge edges straight of course.
Can you show us a picture of the fabric and/or the pattern?
Last edited by GingerK; 02-08-2024 at 01:31 PM.