"I found this bikini at Palace Costume
in Los Angeles," costume designer Janie Bryant told InStyle.com. "I had my fitting with Megan (Jessica Pare
) in the beginning of the season and I had her try on a few different bikinis, but this is the one we knew she’d wear. It’s so beautiful on her figure. The print is very mod." And she's not the only one: Everyone on the beach, including Don Draper (Jon Hamm
), wore vintage swimwear.