The word selvedge comes from “self-edge.” The edge of the denim has a clean finish, since it will not unravel, the edge of the fabric is used as the garment’s outseam. Therefore, looking at the inside of the outseam, is an easy way to identify a pair of jeans made from selvedge denim.
There are variant spellings of the term: selvedge or selvage. Both are grammatically correct. The brand prefers using the former in its product titles and description, because of its direct reference to the root word “edge.”