Shoulder width grip

is the Shoulder width grip, in front of the shoulders or the side edge of the shoulders and also hip with, how to determine the hip width

The easiest way to determine “Shoulder” width grip is to use the thumbs. So for instance the inside part of the hands (thumb knuckle) Should be even with the outside part of the shoulders. to answer simpler i guess would be to use the outer part of the shoulder as you suggested.