Kylie Jenner Reveals What Exactly She Does at the Office — and You'll Be Surprised by Her Go-to Off-Duty Outfit (Exclusive)

When Kylie Jenner launched her makeup brand Kylie Cosmetics with three original lip kits in 2015, it was an instant success and helped launch her to billionaire status at just 19 years old.

Now the mom of two is juggling an array of new ventures, including her clothing line Khy. In an exclusive interview, she tells PEOPLE the pivot to fashion felt like the natural next step in her ever-growing empire.

"I love beauty and fashion," says Jenner, 26. "I have always had a special place in my heart for design, and an appreciation of the artistry behind the brands that I love."

Khy, which drops a new limited collection every several weeks, is comprised of collaborative pieces with designers that Jenner was already a fan of, including British club wear designers Namilia, and Ukrainian denim designer Natasha Zinko.

"I want to see who’s doing cool things and specializes in a specific look," Jenner says of choosing who to partner with.

"Then I think about creating pieces that would be interesting to the Khy audience, but staying true to the designer throughout the whole process. We then focus on design details and a high quality product that we know our customers will love."

It's a process that she says she doesn't just hand over to someone at her design headquarters, which is based in L.A.

"A day at the office usually includes meetings with the design team, mood board creations, drop calendar planning, looking at sketches and fabrics, working on shoot creative and campaigns, and then fit testing pieces from upcoming drops," she says.

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She then officially fit tests every single piece of clothing — but says she isn't the sole fit model, emphasizing that Khy pieces range from size 00 to 4X.

"No, I'm not the main fit model!" she says. "But I do like to try on every prototype we create and make sure it has a great fit and feel. I only want to put out designs that I actually love and want to wear, so it’s really important for me to test out every piece firsthand and make sure it’s perfect."

As for her own favorites from the six various lines available so far?

"I'm obsessed with the faux leather collection from Drop 001. That will always be a favorite of mine since that's where the brand began," she says.

"I'm also obsessed with the dresses from Drop 004 and Drop 006 — the Sueded Stretch Twist Maxi dress is so sleek and sexy and hugs your body in all the right places."

And when she's not wearing a body-con dress?

"I'm usually in one of our comfy tank tops and sweat sets," she says. "My favorite is the Limoncello color."

While Jenner gears up for a new drop, which she'll announce soon, she says she's continuing looking for new designers to work with, and coming up with fresh ideas.

"We focus on pieces that are wearable but fashion forward," she says, adding that she gets inspo from looking at vintage fashion weeks and '90s trends, as well as turning to the City of Light.

"Paris is definitely the most stylish city. I'm always so inspired when I spend time there, and I've done a few Khy shoots there too since I love the energy," she says.

"Khy has been such an amazing outlet for creative expression. It’s so special to me to be able to conceptualize collections and put them out into the world," she adds. "We have some exciting drops coming up that I can’t wait to share!"