See, I have a different take on the original question altogether. For me, screen accuracy can't be solely the generalized version.
What about the following combo?
- dirty armor, pauldron, BFG (no pack and no shoulder pouches)
This was seen on screen in the docking bay encounter. Both packless troopers went without the packs since they were marked to die by the director and didn't want to take a tumble with full packs on. That aside, this combo is still screen accurate for ANH.
Just seems the "essentials" for accuracy don't account for the legitimate exceptions.