In the 10 years that Keeping Up with the Kardashians has been on the airwaves, each of the sisters has become a fashion and beauty mogul in her own right. Kim has KKW Beauty, Khloé has Good American, Kylie has Kylie Cosmetics and Kendall has become a bonafide supermodel. Now Kourtney‘s cementing her footprint in the fashion world, too.
The eldest Kardashian sister and mum to Mason, 7, Penelope, 5, and Reign, 2, is launching her first solo fashion collaboration with PrettyLittleThing, available starting tomorrow at 12am PST. The 32-piece “Studio 54, old Hollywood and ’70s-inspired” collection of sexy sequin mini dresses, faux fur jackets and sparkly biker shorts has Kourtney written all over it — but she didn’t go through the whole design process without a few opinions from her sisters (she is a Kardashian, after all).
“I see my sisters almost every single day, so while I was designing the collection, if I was going over fabric swatches and they were sitting next to me, I would ask their opinion, like confirming, ‘This is really a good dress, right?’ to just kind of get their stamp of approval,” Kardashian told PeopleStyle.
Of course, Kourtney is no stranger to putting her mark on the fashion world. The KUWTK star teamed up with her sisters in 2011 to launch their first clothing brand, Kardashian Kollection, sold at Sears, but this time she was ready to be the woman in charge. “With my sisters, we would always have to incorporate each other’s style into the collection. A lot of times Kim and Khloé would agree and maybe I wouldn’t agree, so we’d have to have a two-against-one rule,” Kardashian told us.
And her love for clothing design extends well beyond her time in the spotlight. The 38-year-old studied fashion design in high school and costume design in college, and still owns the same sewing machine she started using as a teenager.
“I used to sew my friends’ clothes on the weekend if we were going out and they wanted something, just for fun,” she told us. “My love of clothes since I was so young – playing in my mom’s closet and even my passion for interior design – has helped with this.”
In the end, once Kim and Khloé saw their sister’s final pieces, they totally approved of Kourtney’s work. “Khloé wrote me because she was out of town a lot when I was doing it, so I mostly showed it to Kim, but she was like, ‘Oh my god, congratulations. The collection looks amazing. I am so proud of you,'” she said.
Although at times on their hit E! reality show, fans see the sisters bicker and fight (can we all take a moment to remember Kourt and Khloé ruining Kim’s Bentley moment?) when it comes to their separate businesses, they’re each other’s biggest cheerleaders. “We’re 1000 percent supportive and there’s no competition at all,” Kourtney said. “I send inspiration to them all day. Like, if I am looking online and I see a cool ’90s makeup vibe, I’ll send that to Kylie.”
When designing her party-appropriate pieces, Kourtney always had one request: “I would always say, ‘This needs to be shorter, shorter, shorter!'” the petite 5-ft.-o-in. star said. “When I buy something I usually have to tailor it and shorten everything like four inches, but these dresses I didn’t have to do much at all.”
The pieces in Kourtney’s collection are affordably priced ranging from $12 to $100, which was a conscious effort she made to reflect her interest in mixing high fashion and lower-priced pieces. “I love an expensive shoe, so I like mixing an expensive shoe with a more affordable dress,” she said. “I think it’s all about wearing what you love and what makes you feel sexy.
Even though Kourtney’s PrettyLittleThing collection is totally inspired by her own style, we still had to ask her which pieces she would dress all of her family members in.
“I would say the bike shorts are so Kim. One of the colorful furs is definitely Khloé. Kendall, maybe the oversized blazer that you could wear over the bike shorts or as a dress with belt. I would love to see how Kendall would wear that,” she told us. “Kylie is definitely a dress girl — she’d be in one of the sequin dresses. For my mom, there’s a really cool high-neck black long sleeved dress with openings on the side. I could see Mamacita in that.”
And as for herself?
“My favorite piece is the black satin jumpsuit. I love that you can wear it from day-to-night, with sneakers, with boots, with heels or a belt,” Kourtney said. “There are a lot of different ways you can wear it.”
This article originally appeared on PEOPLE.