Looking to turn your old duds into extra cash? Then it's time to clean out your closet—and get familiar with the best sites and apps to sell clothes online. Fish out the beaded '80s dress you wore once to a New Year's bash, last season's now-neglected sandals, and the vintage blouse that no longer fits. It's time to stop letting your garments collect dust and help them find new, loving owners! Here, the 15 best places to sell clothes online, plus tips from pro sellers to help you make the sale. Cha-ching!

Did that vintage dress seem like a great idea in the store but not so much when you got it home? Put it on ASOS Marketplace and sell it! The only catch is that ASOS takes a 10% commission on the sale price. Instead of focusing on designer goods, the seller-driven resale emporium features edgy used and retro fashion, functioning like your very own thrift store. You can find pretty much anything—we scored a Pucci-inspired vintage minidress for $47!

Tap into Etsy's community of artisans and sell your finely curated collection of vintage (or handmade!) styles. Seller fees are on the lower side of the spectrum: Etsy charges a 3.5 percent transaction fee and a 3% payment processing fee (and only 20 cents to list an item). With more than 1.7 million sellers on Etsy, you'll be in good company.

OK, so this one's no secret for girls wanting to score some designer clothes on the cheap—eBay pretty much paved the way for every at-home vendor. The upside of selling your stuff here—especially if it's part of a designer collab—can really start the bidding wars. On the other hand, if you're trying to buy, there's usually no shortage of selection, but navigating between Cuisinarts and lawn mowers (as well as helplessly watching the price shoot up every second) can be seriously frustrating.

"We made an early decision to allow everything to be done on the phone with no need to go to a website," says Manish Chandra, Poshmark CEO and founder. "When selling from your closet, start by listing 5-10 items. We find that closets with at least five listings sell more than those with less. Search for other women like yourself who are likely to be interested in your closet. Whether you share favorite brands or the same size, you'll want to follow them, begin interacting with them, and shopping their closet!"

Poshmark includes all sorts of brands, from Brandy Melville to Céline, so it's important to personalize your presence. "In a way the women are editorializing their style, creating a magazine out of their closet," says Manish. Each woman sets her own price on each item. When a buyer purchases the item, Poshmark emails you a prepaid shipping label—the buyer pays the shipping—and you just print it out, slap it on any box and have your mailman scoop it up."

Sellers keep up to 85% of the sale price, and good quality items will usually sell within three days, so if you need money quick and happen to have some pieces laying around, this is the spot for you. In addition to clothing, shoes, and accessories, The RealReal will also accept fine jewelry, home decor, and even fine art. You can send in your items via USPS, or schedule a free in-home pickup in select metropolitan areas.

Refashioner is an indie girl's dream, featuring "more avant-garde designers and interesting pieces of all sorts—it's not all fancy," says founder Kate Sekules. The site also tries to keep things advantageous for both buyer and seller, so if you've been hanging on to an ultra-unique piece, this might be the place to sell it. "It's hard to let go of the good stuff," says Sekules. Plus, if you're in the Big Apple, the site's into doing events, so definitely keep an eye out for their next sartorial shindig.

Selling's super-easy with ThredUP. They send a "clean out kit" (a.k.a. an empty bag) so all you need to do is fill 'er up and leave it out for the mailman (it ships back free!), and they'll take it from there. The convenience means that sellers take a lower cut, earning a maximum of 80% of the resale price, but the no-fuss process makes it super easy for busy girls. ThredUP's biggest selling point for buyers is the huge inventory. They list more than 5,000 items each day including a rad handbag section that just launched yesterday.

The best thing about LePrix (formerly called SnobSwap) is its swap feature. Rather than buying or selling, you're able to just trade one item for another. "You can buy a gorge Topshop dress for $20 that would retail closer to $80, or swap your cute Nasty Gal skirt for an awesome Zara jumpsuit," say founders Elise Whang and Emily Dang. It's a great idea, because with most sites, buying at ridiculously low prices often means sellers take a big hit on what they're sending in. Swapping not your thing? You can still buy and sell traditionally—and even bargain with the seller to knock a little off the price.

Crossroads Trading has physical locations all over the United States where you can bring in your secondhand designer goods. Instead of lugging in a huge bag of clothes, you can now request a bag with a prepaid shipping label and you can simply mail them in. Crossroads offers 50% payout of the sales price as store credit, or 30% of the sales price as straight cash back. Crossroads looks for "name-brand, on-trend" clothing in good condition, and while their tastes are discerning, it's worth sending in your clothes for the ease. Whatever clothes don't pass muster for Crossroads sales will be sent back to you, or can be donated to charity for a small fee.

Brand-name handbags do exceedingly well on Tradesy, according to the company's CEO and founder Tracy DiNunzio. So, if you have a closet full of purses that are no longer in use, Tradesy might be your saving grace. Tradesy charges a flat commission fee of $7.50 for any item under $50 and 19.8% for anything over $50. In addition to handbags, you can sell everything from shoes to clothing to wedding dresses.

Mosh Posh bills itself as "designer consignment." Mosh Posh sells only the finest, high-end goods, including Prada, Gucci, Hermes, Kate Spade, Louis Vuitton and the like. If you have a Tiffany & Co. bracelet or Chanel clutch just laying around, this might be the best shop to sell with. And, if you live in Florida, you can go directly to their storefront in Tampa.

The Mercari app allows sellers to sell clothing by uploading pictures and listing their clothes, shoes and accessories at whatever price they like. Whatever sells is subject to a flat 10% fee. In addition to apparel, you can sell other items. From cell phone cases to Fitbits to soccer gear, you can sell just about anything on Mercari. The app is intuitive and easy to use.

If you're on Facebook all the time anyway, selling on Facebook Marketplace makes a lot of sense. Not only are there no seller fees or taxes involved, you can easily share your listing to your network. You never know who might be interested in gently-used denim or a once-worn prom dress!

In addition to accepting clothing trade-ins at their stores, Buffalo Exchange also has an sell-by-mail program. Upon request, they will send you a prepaid shipping bag that fits up to 40 pieces of clothing. They will email you with an update of what they're able to purchase, at which point you can choose between a store credit, check, or PayPal payment. If you take a check/PayPal payment, you will be offered 30% of the item's selling price. If you take a store credit, you will receive 50%. For reference, they're interested in men's or women's designer clothing in like-new condition.

As the name suggests, Rebag is an online store dedicated solely to selling handbags. They're interested in designer items, and their featured brands include Balenciaga, Tom Ford, Versace, Givenchy, and the like. If you have a designer bag like this that you'll willing to part ways with, all you have to do is submit a few snaps of the bag on their site. Within two business days, they'll email you a quote. If you accept, they'll provide a prepaid shipping label. Once Rebag receives the bag, your payment will be issued within three business days. Rebag also has physical locations in select metropolitan areas, including Beverly Hills, Los Angeles, Miami, and Manhattan where you can sell your bag directly to them, no USPS required.

Pro Tips for Selling Clothes Online

Now that you know where you can sell your used clothes, here's how to sell them. We asked the experts—professional online clothing retailers—for their top tips on selling secondhand and vintage clothing online.