We flagged it up some time back, but now it looks like the first items in the official Mad Men Collection are now available to buy online at Banana Republic.
The items have landed in the US store (which does international shipping), with clothing and accessories for both men and women designed by Janie Bryant, who designed the costumes for the TV show.
Some examples above and over the page. Above, you can see the lace tipped dress, with short sleeves, a draped neckline, a lace trim at neck and hem, invisible back zip and vented back hem. That sells for $150. The other is the lace dress, which has cap sleeves, a boat neckline and invisible back zip. $130 for that.