Monique Lhuillier Etoile Long unclassified dresses

Gorgeous lace, modified A-line dress.  Top is sheer with plunging neck line, and wide V shape in the back.  Bottom is lined, hugs in all the right places (perfectly accentuates the B-hind), and has a lovely train that isn't too long (it's easy to pick up and walk with, but also bustles as well).