Adjusting the Straps
Now, lets talk about these straps. The front one is a total lie.
If we pull it taut, it goes across the chest rather than over the shoulder. This is because it is set at the wrong angle.
If we force it back towards the shoulder, it will fit the body on the side closest to the Center Front, but wing out all weird near the armpit.
Caveat: If you are working with a body that is larger at the waist than the bust, the straps will angle off the arm rather than onto the chest. When pulled towards the shoulder, the wingy bit will be to the Center Front. The following method will still work to correct the angle of the strap; you’ll just end up with your adjustment on the inside, rather than the outside, of the strap.
Fold out the winginess by pulling the extra down against the body. You will have yet another little triangle.
Check to back to see if any adjustment is needed there. Mercifully, this looks fine.
Bring the straps up to the shoulder, with the front strap over the back. At the top of the shoulder, fold the front strap over itself. The folded edge should hit the top of the shoulder. Mark the location of the fold, and refold.
Line the folded top strap up so that it meets up with the back strap exactly. Mark this meeting point on the back strap. Watchpoint: make sure the front strap adjustment fold is still folded!
Next: Marking changes….