Originally Posted by
NJ Quilter
The most important factor is how the fabric is folded in half. technique for folding to make sure the fold is on the straight. I've adapted a bit but basically start with fabric selvage to selvage. Look for a 'bubble' (easiest done if you're a pre-washer and after ironing). I lay the fabric flat on my cutting table with the fold closest to me and then smooth out the 'bubble'. At that point the selvages will not line up but your fabric will be folded straight. Trim off the wonky end and start measuring from there. Haven't had an issue since.
This works for me, too, even though it really goes against my grain (ha, ha) since I learned the "pull-a-thread" method for squaring up fabric back in the old days when home ec was taught in school. It irks me to lose the wonky end pieces.