A method/shirt cutting jig for converting a textile into yarn comprises mounting a tubular body of a textile on the jig's base, securing a first folded edge of the tubular body using a clamping bar and securing the second folded edge of the tubular body using a clamping panel. The clamping panel includes teeth that allow a user of the jig to cut the tubular body into strips of material fully past the second folded edge. A movable cutting fence enables the user to cut the tubular body into multiple strips of material, but where each cut does not extend fully past the tubular body's first folded edge. The tubular body with the cuts is removed from the jig and then manually cut in a diagonal pattern along its first folded edge to produce a single strip of material that is then easily converted into reusable yarn.