I feel like this is a stupid question. I have always cut selvate to selvage....
but anyway...
I have a charm square, it is recommended to cut on the lengthwise grain.
So I am holding the charm square with two hands, finger and thumb. I give it a tug, and there is a little give. I understand that this is the crosswise grain that is tugging....
If I turn 90 degrees and give it a tug, no give....I know this is the lenthwise grain. Am I cutting on the imaginary vertical line between my thumbs?
Or another way to ask the question, do I want the short side or the long side to be the stretchy side?