"Since I started Mad Men when I was 6, a lot of my interest in fashion sparked while I was on the show; Janie Bryant, the costume designer, is so brilliant, and I've been surrounded by all this great vintage clothing."
On fan mail: "A lot of fans will address me as Sally—which I take as a compliment. Like, 'Oh, I hate your dad! You mom's the worst I want to give you a hug.'"
Dress, $2,650, sunglasses, $400, Fendi; (212) 897-2244. Bracelets, from $950 each, ERA by RG Jewelry; erabyrg.com.
"These Miu Miu shades are so fun. They put me in a good mood whenever I wear them. They're bold, so I like pairing them with simple outfits."
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"I got a record player from my parents for my birthday—supercool present."
On what's next: "I don't know what my sweet 16 holds, but my quarter birthday is coming up! So that's what I'm thinking about."
Belted dress, $2,600, Marc Jacobs; marcjacobs.com. Sweater, $1,390, Oscar de la Renta; nordstrom.com for stores. Brooch, price upon request, Chanel; (800) 550-0005. Ring, $725, Jennifer Meyer at Barneys New York; (212) 826-8900.
This article appears in the April issue of Marie Claire, on newsstands now.