The last quilt I made had stripes on it.
Well, guess what, If I folded the material and matched the stripes on each end, it matched about half way down the fold, then it had a huge crooked fold from the middle to the end.
The material had to be crooked when they put the stripes on it.
They were about 2 inches off. So, took an inch off of the top right hand corner and about an inch off of the bottom left corner. It looks straight to me, however, I know its crooked, but you really can't tell. Next time I buy plaids or stripes, I will double check the directional material first.