A primer on today's wonderfully wide, ever-growing world of secondhand.

Plus, Duro Olowu creates exhibit for Chicago's Museum of Contemporary Art.

Plus, the fur industry is promoting sustainability in an effort to fight back.

Power sellers and top earners from Grailed, Poshmark and StockX weigh in.

With mobile shopping, peer-to-peer e-commerce and influencer marketing continually on the rise, social commerce is finally becoming the next wave of retail.

Plus, how climate change forced fashion to get serious about sustainability.

We have all the answers.

Plus, Reformation is launching in the U.K.

Meet the sellers flipping secondhand clothing seen on shows like "Gossip Girl" and "The Vampire Diaries."

The earnings have been spread across four million sellers on the site since its founding in 2011.

Secondhand and consignment retailers are seeing growing interest in the actress-turned-royal's preferred brands and styles.

Chatting with a stylist (some human, some not) is the hot new thing as retailers develop their "conversational strategies." What's next?

The fashion-tech entrepreneur discusses the challenges of switching careers and growing her company in the competitive online resale space.

We spoke to expert sellers from Poshmark, Grailed and Depop.

Including his (and his son's) blue suits from the "Grateful" album cover.

Plus, LVMH launches e-commerce for its wines and spirits brands.

Plus, slashers destroyed unwanted product from Nike's SoHo store.

Companies like Poshmark, The RealReal and ThredUp have raised hundreds of millions of dollars in venture capital over the past few years. Can they measure up to all the hype?

Once only a secondhand marketplace, Poshmark now allows some sellers to buy wholesale from participating retailers.

The second-hand marketplace wants to turn more of its users into small business owners.

Secondhand stores have gotten a sizable inventory boost since Marie Kondo's "The Life-Changing Magic of Tidying Up" hit the U.S. this fall.