This welt isn't just a pretty touch, it's hiding the seam for a pleated pull that helps create the smooth surface of the curvy inner sides and inner back.
In progress
Making good progress on this pair!
Hand stitching
I recreated the front arm panels and now applying them with hand stitching.
Close up
A close up of the front arm panel and cushion. What a nice snug fit!
Cozy pair
Another great example of that recovering an old piece can really freshen up the look.