thanks for the reply!
that makes a lot of sense with the potential inaccurate readings. however if the testing was set up to be in the same position every time, can the stretch sensor produce a "weight" reading? The main goal is to understand the initial stretch reading, and then once the content has been changed, to measure again and see the "difference" from the initial reading. Do you think this is possible?
With the other suggestion of the "load cell", is the suggestion to have this sensor on the top of the shoulder? assuming I am measuring the pressure produced from the contact of the strap to the shoulder?