1. Design Limitations
I put comfort, ergonomics and elegance at the top of the design criteria list for the core range.
Whilst it is perfectly possible* to have a one-piece strap made to a fixed size that would exactly match you and a particular guitar, most of us prefer the option of at least a little adjustment.
(*Provided that it's not longer than the leather hide available, of course).
The size of the shoulder pad affects the nature of the whole strap and is where I begin from in the design process. Its width and length governs how well the weight is spread over your shoulder. I started making straps in the first place because I couldn't find one in the shops that was suitable for my bass - they were all too flimsy or too narrow or both.
NEXT: Length Adjustment