The dress that Margot is wearing in that picture Thalia, is, dare I say it, nice. The sleeves are not bell-like or unnecessarily flouncy. The white/cream stripe adds something to it and the pink, well it's not too in-your-face pink either. On top of all of that, it's being worn by the stunning Penelope Keith...
I do like the comment you've put with it though...takes me right back!