Selvedge, or selvage (both are commonly seen and correct), is the edge of a fabric as it comes from the old shuttle loom weaving from one side to another, it creates the edge itself. These shuttle looms weave a narrower 30-inch (finished) or 35-inch (raw) fabric, which is on average half the width of modern projectile looms.
WHAT'S THE DIFFERENCE?
Selvedge fabric is one of the oldest weaving technics from the old days, and all the machines that take part in the process doesn't have the modern controls. which leaves the original characteristics on the fabric itself. For example, some degree of leg twist is normal, some knots, etc, and it also shows the vintage natural of the selvedge denim.
There are some major defects that are not acceptable. In order to create the unique experience, and we meant to keep it on the fabric roll. It's your decision to play around the defect to make your own unique jeans. Or you can cut out.