Most brand possibilities have been named but my maybe list includes:
Reiss, Boss, Theory, Talbots, Lafayette, Pendleton, Brooks Brothers, EF though those skew casual . Anthroplogie because they stock random makers and a lot of unexpected dresses though most are casual/ unusual. In department stores, look at RL and Calvin Klein; though these are not high end fabrics, they make simple classic shapes.
Fabrication is difficult since seems to have declined. I’d be willing to skate on that a bit ( not thin jersey, but ponte, etc) if cut and fit are perfect. Hence EF who has good fabrics but dresses might be knits, or Talbot ponte, if fit great, comfortable ( so one feels effortless) great neckline, in black, cocktail lighting, sparkly accessories, who really knows?
And maddenly, a maker may make “ one” such dress randomly one year and sell out.