While "Mad Men" fans will have to wait until this Sunday (July 25) to watch the highly anticipated season 4 kickoff, the cast and a few select guests got a sneak peek last night at the Banana Republic-sponsored premiere party in Los Angeles.

Of course, perhaps as exciting as the show itself was seeing what the stars of the award-winning series would don on the red carpet.

And while January Jones was absent, Christina Hendricks, Elisabeth Moss, and Jon Hamm all showed up -- with both women in somewhat quizzical getups.

Hendricks chose a short, black Dolce & Gabbana cocktail dress with a long-sleeved lace overlay, which gave it a very "Pretty in Pink" feel -- definitely more '80s prom than "Mad Men"-era '60s.

She paired it with Dolce & Gabbana crochet pumps and, in true Joan Harris fashion, her signature red mane swept back into an updo.

Moss, who plays much-loved working girl Peggy Olsen, also went the decade-of-excess route, sporting an emerald green taffeta asymmetrical dress that cinched her waist and had a ruffle cascading down the front.

Current W cover guy Hamm kept it classic, however, channeling his now iconic character Don Draper in a sharp, two-button suit, skinny tie, and pocket square that would work as well in 1962 as 2010.

Do you want to dress like the stars of "Mad Men"? Banana Republic has you covered with the company's second Mad About Style campaign, which shows fans how to use the retailer's office-appropriate inventory -- pencil skirts, cardigans, blouses -- to recreate the Sterling Cooper experience (minus the martinis and chain smoking).

You can also opt for "Mad Men" costume designer Janie Bryant's new vintage-inspired collection for QVC.