So much, right? Well, even though he'll be off the air forever in a few weeks, we're offering a way to snag his magic: We teamed up with Lionsgate and Mad Men’s award-winning costume designer, Janie Bryant, to bring you the ultimate giveaway: One lucky reader will score a suit from Don's own closet, worn by Jon Hamm on the show. The prize includes a suit jacket (which features the exclusive Mad Men label Bryant designed herself), suit pants, a shirt, and a skinny navy tie.

So How Do You Win?By channeling the show yourself! To enter the contest, post a picture of yourself in a Mad Men-inspired look on Instagram or Twitter and tag it with #MadMenStyle. We'll be gathering all your entries on instyle.com/madmencontest. Bryant herself will be selecting the winner based on creativity, charm, and originality. You have until April 30, 2015, to submit your photo. So go ahead, go retro!

PHOTOS: See the Best Looks from Season 7 of Mad Men