Following is an excerpt from Overdressed: The Shockingly High Cost of Cheap Fashion, out now from Viking.

It was early morning at the Quincy Street Salvation Army, an easy-to-miss location tucked away on a Brooklyn side street. The only donations that had come in so far were books, an entire truck full from one single apartment. Charitable clothing donations usually roll in with fits and starts, with the changing of the seasons and at the end of the year, when people are looking for tax write-offs. It was on a weekday morning in the middle of the fall, the off-hours for clothing donations. But I didn’t have to witness someone pulling up their car and shoveling bags full of clothes from the trunk. I’d been that person innumerable times, lugging overloaded trash bags, pierced by the heels of cheap pumps, sleeves and pant legs hanging out, to a local charity. I had never known what happens after I drive away and leave my old clothing orphaned on the Salvation Army’s doorstep.

Michael Noneza, otherwise known as “Maui,” one of the donation center’s assistant supervisors, bounced into the warehouse. “You ready?” the cheery Pacific Islander asked, and ushered me over to a massive freight elevator and pressed the button for the third floor. The elevator jolted upward and the doors opened on a scene that looked a bit like a threadbare Santa’s workshop. Dozens of Hispanic women were standing behind a row of wooden slides, pulling clothes out of elephantine gray bins and separating them into broad categories like jackets, pants, and childrenswear. “We keep only the best,” Maui told me. “Then it’s ticketed and priced.” The pricers, perched on what looked like adult high chairs, quickly and methodically moved through racks of 80 garments each, making snap judgments based on condition and brand.

The Quincy Street Salvation Army may be on a quiet out-of-the-way street, but it is the main distribution center serving eight Salva­tion Army locations in Brooklyn and Queens. It processes an average of five tons of outcast clothing every single day of the year, and much more during the holiday season when donations spike. From that astonishing mass, the sorters choose exactly 11,200 garments a day to be divided up equally between the eight thrift stores they serve. I asked Maui if they’ve ever hit a dry spell, where the donations dipped too low to fully restock each stores with their share of the 11,200 items. He laughed, “We never run out of clothes. There are always enough clothes.”

What American doesn’t have something hanging in his or her closet worn only once or twice, a pair of pants waiting for a diet, or even a brand-new dress or jacket with the tags still on? Common sense and everyday experience tell us that we have so many clothes that a major­ity go underused and neglected. According to a 2010 national survey in ShopSmart magazine, one in four American women own seven pairs of jeans, but we only wear four of them regularly. Not surprisingly, charities regularly see brand-new clothes come in with tags still affixed. “We see people throwing away new stuff every day,” Maui says.

There is an enormous disconnect between increasing clothing con­sumption and the resultant waste, partially because unworn clothes aren’t immediately thrown out like other disposable products. In­stead, they accumulate in our closets or wherever we can find space for them. Master closets now average about 6 feet by 8 feet, a size more typical of an extra bedroom 40 years ago.

Maui and I took the elevator back downstairs and walked into a dimly lit warehouse hidden away on the far side of the donation drop-off area. Garments that make it into the Salvation Army thrift stores have exactly one month to sell. Then, they’re pulled from their hangers, tossed in bins, and end up back in a room such as this one.

In the rag-cut room, two men were silently pushing T-shirts, dresses, and every other manner of apparel into a compressor that works like the back of a garbage truck, squeezing out neat cubes of rejected clothing that weigh a half ton each. The cubes were then lifted and moved via forklift to the middle of the room, where a wall of wrapped and bound half-ton bales towered. I saw tags for Old Navy, Sean Jean, and Diesel peeking out of the bales, as well as slivers of denim, knits in bright maroons and bold stripes, and the smooth sur­faces of Windbreakers. Smashed together like this, stripped of its sym­bolic meaning, stacked up like bulk dog food, I was reminded that clothing is ultimately fiber that comes from resources and results in horrifying volumes of waste. Clothing stores completely separate us from this reality, and a “rag-cut” room brings it home in an instant. The Quincy Street Salvation Army builds a completed wall made of 18 tons, or 36 bales, of unwanted clothing every three days. And this is just a small portion of the cast-offs of one single Salvation Army location in one city in the United States.

Most Americans are thoroughly convinced there is another person in their direct vicinity who truly needs and wants our unwanted clothes. This couldn’t be further from the truth. Charities long ago passed the point of being able to sell all of our wearable unwanted clothes. According to John Paben, co-owner of used-clothing processer Mid- West Textile, “They never could.”

There are thousands of secondhand textile processors in the United States today, mostly small family businesses, many of them several generations old. I visited Trans- Americas Trading Co., a third- generation textile recycler in Clifton, N.J., which employs 85 people and processes close to 17 million pounds of used clothing a year. Inside Trans-Americas, there is a wall of cubed-up clothing five bales tall and more than 20 bales long. “This is liter­ally several hundred thousand pounds of textile waste, and we bring in two trailer loads of this much every day,” Trans-Americas president Eric Stubin told me. The volume they process has gone up over the years alongside our consumption of clothing.

Without textile recyclers, charities would be totally beleaguered and forced to throw away everything that couldn’t be sold. Charities might even have to turn us away. The only benefit to this doomsday scenario is that our clothes would pile up in our house or in landfills, finally forcing us to face down just how much clothing waste we cre­ate.

A majority of the clothing processed at Trans-Americas comes from overburdened charities within a thousand-mile radius of New York City. Used clothes come into the warehouse in mixed bales like those I saw at the Quincy Street Salvation Army. “I like to call it the good, the bad, and the ugly,” Stubin said, as we sailed past women separating pants from shirts and sending them down long slides. “We get everything from torn sweaters to spoiled and stained towels to good useable clothing.” Stubin’s sorters separate the wearable stuff into two hundred broad categories like cotton blouses, baby clothes, jackets, sweaters, khaki pants, and denim. “From there, sorters begin to look for quality and start sorting the worn from the torn and mak­ing various grades,” Stubin explains. The higher-skilled employees “develop an eye,” he says, for coveted brands, cashmere, and the gold mine vintage finds. But a lot, at least half of what Trans-America pro­cesses, is “the bad and the ugly.” This is the situation in general in the textile recycling industry today.

* * *

Most of our donated clothing does not end up in vintage shops, as car-seat stuffing, or as an industrial wiping rag. It is sold over­seas. After the prized vintage is plucked out and the outcasts are sent to the fiber and wiping rag companies, the remaining clothing is sorted, shrink-wrapped, tied up, baled, and sold to used-clothing ven­dors around the world. The secondhand clothing industry has been export-oriented almost since the introduction of mass-produced gar­ments. And by one estimate, used clothing is now the United States’ number one export by volume, with the overwhelming majority sent to ports in sub-Saharan Africa. Tanzanians and Kenyans call used clothing mitumba, which means “bales,” as it comes off the cargo ships in the shrink-wrapped cubes like the ones I saw at Trans-Americas and Salvation Army. The bales are cut open in front of an eager clientele and buyers, who pick through it for higher-value finds.

Once again, while many Americans might like to imagine that there is some poor, underdressed African who wants our worn and tattered duds, the African used clothing market is very particular and is demanding higher quality and more fashion-forward styles. Paben told me that access to the Internet and cellphones has made the con­tinent fiercely fashion-forward in recent years. “There’s been a change in what you can sell there,” he says, and the bales have to be much more carefully sorted based on style, brand, and condition. As incomes rise in Africa, tastes become more savvy, cheap Chinese imports of new clothes flood those countries, and our own high-quality clothing supply is depleted, it’s foreseeable that the African solution to our overconsumption may come to an end. What then?

On a recent Saturday morning, I was back at the Quincy Street Salvation Army shopping for a vintage coat, hoping to find quality and craftsmanship I could actually afford. This particular Salvation Army is roughly the size of an airplane hangar, and deathly quiet in the mornings. I hoped to make a score while the rest of Brooklyn slept off their Friday night. As I flipped through the women’s tops, I noticed a Salvation Army employee in a smock, methodically walking past me. At first I thought she was straightening the racks and hanging clothes back up that had been pulled to the floor, but then I realized she was carrying clothes away. She looked at the color of the price tags stapled onto each garment. Then, she plucked out the ones that had sat there too long unsold, like eggs gone bad, and chucked them into those huge gray dumpsters I saw in the sorting room up­stairs. Soon enough, I thought, they would be shredded or on their way overseas.

Excerpted from Overdressed: The Shockingly High Cost of Cheap Fashion. Published by Portfolio/Penguin. Copyright Elizabeth L. Cline, 2012.