Banana Republic

Beginning today, customers who want to win a walk-on role can enter a contest by picking up a voucher at retail stores that will give them an online code which lets them upload photos of themselves dressed in swinging 60s Madison Avenue style.

Banana Republic will promote the series through a style guide, window displays and online instructional videos

Source: http://business.financialpost.com/2010/07/21/fp-marketing-mad-men-season-4-let-the-marketing-juggernaut-begin/