This is Rachel McAdams in a Philip Lim dress.  And while that front slit would need a tweak, I loved the knotted neckline, swingy front ruffle and perky sleeves.  It's a stunning curve-hugging silhouette, not skin tight, and makes her look so feminine. 

You could completely do away with that front slit, or make it a small key-hole, and this dress would still be gorgeous.

So 40's!  So lovely!  And you know I love a retro style.  I expect you can't wear this dress and not have a wiggle in your walk and giggle in your talk.