Thanks, all. I think I am going to wear the version with the black slip and the jacket. I don't love it without the jacket but I do like it a lot better with the jacket. It will prevent me from freezing too! (I am planning on wearing boots to get to the party in, then I will change shoes at J's office, which is across the street.)
Lyn, the slip is basically like a long tube, so I could definitely adjust it up or down a bit. I wasn't very careful about that when I tried it on. I have to admit that I like it a bit higher because this way it covers ALL of the cleavage. (And I am a C cup! I have such respect for the cleavage challenges large-breasted ladies must have!)
So re: nude or gold camis. I have never found a nude cami that is actually nude on me. They are all too light and/or cool toned. Although nude hose has come a long way in terms of ethnic skin colors, other "nude" items have not! Similarly, for gold, the color of the dress is a very difficult gold to match. It's kind of an old gold/slightly bronze tone with texture. Most gold items are too pale and shiny and look odd with it. That is why I am not using my gold clutch.
Anyway, so I think I am stuck with black or a color. Black lace or black with sparkly trim might be something to look into for the future.