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

Experts from The RealReal, ThredUp and more weigh in.

Plus, how Supreme Italia gets away with legal fakes.

Reformation, ThredUp, the Ellen MacArthur Foundation and the New York Department of Sanitation are just a few of the parties involved.

As conversations around sustainability reached a fever pitch, the resale market has exploded.

The online thrift shop is using stats to create new pieces designed to thrive in the resale market.

With more brands to come.

Online resale site Thredup wants to put out the fire.

Plus, Reformation is launching in the U.K.

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

Plus, Thredup launched an artist-designed sustainable tee collection.

Watch out, Zara: Millennial shopping preferences are veering more sustainable.

Plus, how Shia LaBeouf's odd sartorial pairings made him an unlikely style icon.

Start your sartorial KonMari-ing now.

Plus, Kith teased an upcoming "SpongeBob Squarepants" collection.

Unless you want them to sell those gifts online, according to a new report by ThredUp.

It's hoping to lure sellers away from competitors with enticing deals, like 100 percent commission.

Plus, top buyers and sellers of New Balance items differ between red and blue states.

Online resale is still hot, but this OG company sees opportunities offline, too.

And Crocs are a huge hit, too, according to a recent report by ThredUp.

Growth of secondhand e-commerce is outpacing offline resale, off-price chains and retail as a whole according to a new report.

Many women are trying to get rid of their Ivanka Trump brand items, it seems.

We got tips straight from the pros.

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?