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Hailey Bieber's staple styling piece is simpler than you might think.

In a recent photo dump posted to Instagram, the model shared a few different looks that all incorporated a classic yet subtle wardrobe staple: white crew socks.

First, Bieber wore a little black dress that featured floral details across the hem of the bust and on the straps; she paired the piece with a black handbag, white socks, and glossy black loafers. In another photo, she channeled her feminine side in a nearly sheer floral midi dress, which she wore with sneakers, white socks, a black handbag, and chunky gold jewelry.

Finally, she shared photos of an outfit she wore to support husband Justin Bieber during the European leg of his Justice World Tour. She looked effortlessly cool in a cropped vintage tee that read, "Peachtree Road Race '84," which she paired with an oversized black leather jacket, a nylon miniskirt, and a matching long belt. She finished the look with white crew socks and black sneakers, plus a pair of cat-eye sunglasses.

A post shared by Hailey Rhode Baldwin Bieber (@haileybieber)

Lately, Bieber has been busy promoting the launch of her new skincare line, Rhode, which officially dropped in June. The model previously talked to BAZAAR.com about her mission for the brand and the idea of treating your skincare products like your wardrobe.

"My ethos behind the brand is that we want to make one of everything," she said. "One really good moisturizer, one really good hydration serum, one really good lip product. ... I believe in curating your essentials in your closet the same way I believe in curating your essentials in your skincare."