This iron on tape is 7/8" wide and is ironed on the front edge of tailored jacket.
It is placed down the lapel front, along the edge of the lower front of the jacket, and around the curve at the hem. It pulls ever so little at the hem curve to prevent it from rolling outward. It also ensures that the lapels lay flat.
This tape can also be ironed onto the roll line of the front of the jacket.
Because it is only 3% off grain, it can be pulled to help the curve around the bust at the critical bust apex area.