Celine

If you thought the hula hoop bag shown during Chanel's Spring 2013 show was a one-off exhibition piece, you were wrong. Paris department store Printemps has purchased the oversize runway bag and plans to sell it — and several much smaller versions — next Spring.

Why? The bag was a hit on social media platforms like Instagram and Twitter, where users voraciously liked, retweeted, and otherwise shared pictures of it and other unusual Spring runway items, including Céline's "furkenstocks" (double-strap sliders with brightly colored fur footbeds). According to WWD, buyers and retailers are paying an increasing level of attention to what their customers like on social media, because they turn into actual sales.

Claire Distenfeld, owner of Fivestory in New York, said she presold six pairs of flat sandals from Giambattista Valli after posting a picture of them to Instagram. "I always sell a ridiculous amount of product on Instagram and it doesn't stop at jewelry or $850 shoes," she said. "It can be Balmain or big things that you don't put your credit card on the computer to buy but you call the store and order over the phone."

A look at the products social media turned into bestsellers, here in the gallery.

Out with the old, in with the new: the sharp and bright separates that defined last season at Céline have been replaced with slouchier, softer shapes in crisp monochrome hues. Black, white, and navy dominated; on silky tops, wide-leg trousers, cropped leather tees, boxy blazer vests, and mesh-paneled dresses, they looked striking and allowed for Phoebe Philo's new twisted fabric motifs to really shine. And though there were also some sweet charmeuse slipdresses and coolly deconstructed trench coats in pastel hues like lavender, blush, and cream toward the end of the show, it was Philo's layered leather clutches with rolled tops that really had heads turning.

If you can tear your eyes away from the parade of fuzzy slippers coming down the runway, then you can refocus your attention to the Spring lineup offered up by minimalist maestro Phoebe Philo. Above the ankles, Philo's collection delves into new territory, most notably with her accessories, but also with other twists — quite literally: the twisted fabric looped over a shoulder and fastened across the chests and waists of her tops, creating a new architectural storyline in the midst of her simplified, more menswear-informed silhouettes. To that end, we also get get unfinished, raw hemlines that felt a little disheveled, a little sexy maybe. Speaking of sexy, there was that, too — a pretty obvious nod to more sensuous Spring dressing with curve-conscious v-neck dresses, inset with eye-catching netting. As far as wearability, Philo's slouchy separates and clean-cropped leather may rank highest on that list, but it's the shoes and accessories that fascinate — and if the success of Céline's other handbags are any indication, then it's the fresh riffs on the clutch (resembling a kind of luxe paper-bag lunch) that will likely be the biggest draw come Spring.

• Trends: Netting, leather, and crop tops.
• Colors: White, black, navy, and a pop of pastel.
• Key Piece: The sexy dresses with deep necklines inset with netting.
• Accessories: Fuzzy, slipper-style flats and pumps, and roll-top clutches.
• Who Should Wear It: Chloë Sevigny and Anna Dello Russo in the shoes, while we're sure the rest of the fashion elite will be toting the new clutches next season.