It is described herein an adjustable rigid clip assembly comprising an anchor plate joined with a connector plate and a slide plate. The anchor plate is joined with the connector plate at a juncture having a juncture angle between the anchor plate and the connector plate in a range of between 0° and less than 180°. The connector plate comprises at least one connector plate slot and at least one connector plate lock. The slide plate may comprise at least one slide plate lock. The at least one slide plate lock may be engaged with the at least one connector plate lock. The slide plate may further comprise at least one slide plate tab passing from the slide plate through the at least one connector plate slot.