Although the teenagers didn't ask their older siblings Kim, Khloe and Kourtney Kardashian for tips before designing their new affordable clothing line for PacSun, they admitted they have influenced their personal style.
Kylie said: "We didn't want any advice from them, we both wanted our thoughts to be organic."
Kendall added: "We grew up watching what they wore and how their style evolved."
Kendall, 17, and Kylie, 15, recently admitted they are pleased to have "generous" siblings who allow them to borrow their clothes.
Kylie said: "I think that's the majority of fights sisters get into but our older sisters are so generous. I'm surprised. They let us borrow pretty much anything."
The teen models, who are regularly spotted wearing the latest designer clothes and accessories, also revealed that they are much more private than most of their friends because they are often worried about what people will think about them.
Kendall said: "I feel like when you're in front of the cameras, you're a little more cautious about everything and there's not a lot of room for mistakes. We're much more private internet wise. We're way more cautious about what we say and what we do than we would be otherwise."