How about a black jumpsuit. This would be my 'dress' of choice for a special occasion.
The Asquith one is brilliant. Bamboo, ultra comfortable, with heels and jewellery very comfy and stylish. After Christmas you won't want to take it off and can be worn around the house, or even as pyjamas.
painting
To think that London, or anywhere else for that matter, does not belong to any one demographic