Kylie and Kendall Jenner have gone to the dark side! Of fashion, that is.

The Jenner sisters previewed their new holiday collection for PacSun in an Instagram video on Thursday (Nov. 5), and it appears that the young fashion icons are spicing things up with some edgy looks.

In the video that Kylie also posted to Instagram, the Jenner sisters are shown wearing an array of dark outfits. Kylie, 17, rocks a black dress topped with a furry white vest, while Kendall, 19, sports a long-sleeved black crop top and pants.

The ladies pose rather fiercely beside two wolves. We're talking actual wolves here.

In another shot, the sisters wear sweaters and companion t-shirts. Kendall's reads "Best," while Kylie's reads "Bitches."

The Jenner girls launched their women's clothing line for PacSun in February of 2013 and reportedly design the attire themselves. So far, they have produced an array of bohemian-esque pieces. This newest collection seems to be more '90s inspired, with velvet dresses, plaid skirts, and cozy knit sweaters.

"What we love the most about our new holiday collection with PacSun is how it perfectly balances out our unique styles," the sisters told Us Weekly. "We broke it out by each of our favorites, so fans can see what pieces fit our personal styles."

As evidenced in the siblings' flurry of Instagram selfies, Kylie tends to have an edgier sense of style while Kendall, now a budding model on some of the world's biggest runways, has a more elegant look when it comes to what she wears.

The fusion of the two approaches to fashion is certainly apparent in this collaboration.

The 30-piece collection will officially launch in stores and online on Nov. 7.

Additionally, Kendall and Kylie will make an appearance for their holiday collection at the PacSun at Woodfield Mall in Schaumburg, IL on Nov. 8.