Brunswick Rubber drop Pockets? Shave corners?

[Lawnboy77]

Why are the side pocket facings curved, does pulling the cloth tight do this???

Looks to me like the subrail behind the facings are cut at a different angle than the cushions.

 

[bradsh98]

Why are the side pocket facings curved, does pulling the cloth tight do this???

Cutting the featherstrips too long could cause this. It pushes the facings outward, causing that curve.