Mad Men has really done wonders for vintage silhouettes, even spawning an entire Mad Men Collection at Banana Republic. I love ladylike shapes, keep on influencing fashion Mad Men!
Personally, I buy true vintage, very rarely repro, and one of my favorite go to's is Etsy. It's kind of like a vintage mecca. Pages and pages and pages of vintage in every price and every state of condition. Faaaabulous!
I don't know if Mad Men uses actual vintage dresses or if they custom make each dress. If it is the former though, I think this dress would be perfect for Christina Hendricks' character Joan Holloway. Viva Voluptuous Vintage!
Vintage 50's Blue Plaid Wool Mad Men Wiggle Dress , Facet of Imagination Earrings , Malachite Sugarloaf Ring , Charles by Charles David Tasse Pump , Vintage Deep Bourbon Leather Oversized Handbag