I need a dress for smart occasions

[SilverHawk]

Something that is a cross between COS, Ben de Lisi and Wall .
Like Dame Judi would wear but not too ethnic so not East.
Where should I look?

Understated, dark colours, lowish neckline, 3/4 sleeves says Judy Dench to me.
adrianna papel
ralph lauren
fenn wright mason

Thanks FauxFox, I've had a good look at those dresses. All three are very 'safe' and not quite what I'm thinking of. I have thought further and think that I need something quirky in the dress like some asymmetry or an unusual neckline/collar. Something a little different but won't raise eyebrows.