Ditch the 'fat suit'
I know why Vidor chose to make Stella more unattractive by having Stanwyck wear the obvious padding under her dresses. But, I really don't think it was necessary. Stanwyck "played" the rough around the edges, socially ungraceful character just fine and convinced me that she was just that without the tricks to make her seem more unrefined. The padding was pretty distracting actually.
What a great film!