Jinx Essenwanger is looking for underwear for my wedding day

I am wearing a Vera Wang gown from a movie..so excited. (picture1) it is a ball gown with a sweatheart neck and basque waist. most of strapless bras are or unsexy of too high so it shows on the middle of the sweetheart. Thought about a white corset from Agent Provocateur but I am afraid that the knot at the back will show or i would get some fat rolls on the back (mostly normal body people get those with corsets) I want something sexy, that makes my waist smaller but I can breath. I saw in mission impossible ghost protocol that the girl had cool one under her dress (picture 2)at least made her upper body look gorgeous... it MUST be sexy and main problem zone: waist and of course some push up action wouldn`t hurt anyone... hope u can help me cause I have been looking for months! (it doesn`t have to be white) it can be shipped to america, germany, england and italy as well