Do you mean that Pied a terre one?
If so that dress is STUNNING!
Yes I would probably wear a control slip underneath it because being a little more support would definitely help. The draping is OH so flattering anyway and if it is the electric blue one the colour OH SO AMAZING!
That is a FAB dress, you will ROCK IT!
Ok, my top tips. Control tights in a light shimmer or control micro nets to make your legs look there absolute best. A slightly higher heel than you would normally go for to thin you down even more, a great fitted bra to lift you up even more.
A statement bracelet to pull attention to your hands and wrists
A short necklace because that neck line is amazingly flattering on everyone women.
A clutch to die for
A blow dry for your hair and maybe something glittering to wear in it a fab clip, or side tiara even will make even the shortest hair look seriously glam.
Make up to enhance your best features (eyes, lips, jaw line whatever)
Now the difficult bit, stand in front of the mirror and SAY I LOOK FAB, I HAVE amazing x,y,z (pick your best bits we all have them) and repeat it everyday until you start believe it! Because the one thing that will make you look amazing is ATTITUDE, if you feel amazing you look amazing.
Go for it have a good time, and remember you are a wonderful person and you look a million dollars.