Dress: Consignment shop (try this this or this). Coat: Mens vintage. Hat: H&M. Two tone loafers (similars here & here in b/w). Mens vintage in Brooklyn. Backpak: Kurt Geiger (instagram followers already know about it) - found this similar version.
Recently I went with a dress plus mens vintage loafers. Tip: Wear two pairs of tights to keep your legs warm.
On a side note: I did a Q&A recently with Saks.com. Check it out here! The street style photos that I shot for them should be up on their site soon!