Originally Posted by
carol45
It seems to me that tearing either WOF or LOF should always be straight, but sometimes, because the fabric has stretched, it seems not to be. I think that's what happened in this case, and my additional stretching made it OK.
It's because of the grain of fabric. WOF is stretchier than LOF. this is because of the way the fabric is woven on the loom. The LOF grain is woven more tightly, therefore having less give and stretch.