Topshop Designers Kendall and Kylie Jenner on How They Would Dress Each of Their Sisters

The Jenner sisters aren't satisfied with social media stardom--now they want to design your wardrobe.

The Jenner sisters aren't satisfied with social media stardom—now they want to design your wardrobe. And look, they're good at it!

Kendall and Kylie Jenner are many things (reality-TV royalty, social media powerhouses, paparazzi bait, high-fashion model in the case of Kendall, hair-color chameleon in the case of Kylie...), but what they don't pretend to be are traditional fashion designers. "Sew?" says Kendall quizzically when asked if she's ever made anything. "Like, sewing clothes? I've never sewed anything in my life." Then she asks earnestly: "Is that a problem?"

Nope—we don't think it will be. The sisters, 19 and 17, have been collaborating on various fashion lines for over two years now, to much commercial success. And while their debut Kendall + Kylie collection, which launches at Topshop this summer, may not be stitched by them personally, it has all the hallmarks of their cool California style. Think easy black maxidresses, sun-faded jean shorts, sweet eyelet tops, and punchy florals meant to be Instagrammed.

The two sisters have distinct looks, they're quick to point out: "I'm more casual," says Kendall. "Kylie makes sure everything is perfect." Kylie agrees: "I'm way dressier than Kendall. I'll go to lunch in heels and a dress." That said, they generally gravitate toward the same pieces, even if they put them together in different ways. And both siblings have plenty of fashion know-how. Kylie shops and collects shoes like it's a sport, while Kendall has been in a total immersion program on fashion, thanks to her modeling career. "Traveling to Paris and working with some of the most gifted designers—it rubs off on you," says Kendall, who counts Chanel's Karl Lagerfeld, Givenchy's Riccardo Tisci, and Balmain's Olivier Rousteing among her inner circle. Not a bad sounding board!

So what are the two designers-in-training looking forward to wearing from their new line? And what else are they throwing on this summer? We quizzed them on the set of their Glamour shoot; listen in.

Glamour: OK, ladies, which outfit would each of you wear on a date?

Kendall: The flowy black high-waisted pants and a crop top with lace-up gladiator heels.

Kylie: Our simple white over-the-shoulder T-shirt with jean shorts and cute heels.

Glamour: How about the weekend?

Kendall: Denim shorts and the white eyelet top with lots of necklaces and rings.

Kylie: The floral pieces. They're colorful and fun.

Glamour: What would you wear to babysit your niece North?

Kendall: The black jumper.

Kylie: A crew neck and no accessories. North can get a bit wild.

Glamour: To take an Instagram selfie?

Kendall: Something simple like the white cropped tee. I don't like wearing anything too crazy, because it takes away from the selfie.

Glamour: What would you style your sisters in?

Kendall: The black pants for Kim, but she'd have to style the rest. She's too diffi—she can figure her own thing out! The jumpsuit looks good on tall girls, so I'd put Khloe in that. And Kourtney would look cute in the short romper.

Glamour: Who takes longer to get ready in the morning?

Kylie: Me.

Kendall: Yes, Kylie. She just took, like, four hours!

Glamour: What's your favorite summer memory?

Kendall: Fourth of July in Malibu with family and friends. Kylie, my dad [Caitlyn Jenner], and I used to go to this place near our house there that shoots off fireworks. We'd put towels on top of his car and sit up there with snacks, watching the fireworks, just the three of us.

Watch: 5 Questions for Kim Kardashian at Glamour Magazine's February 2011 Cover Shoot