The average closet contains $460 billion worth of clothes that are no longer being worn, across all American consumers. ThredUP processes approximately 1,500 orders daily. Levi’s reports diverting 41,581 pounds of fabric from landfill through its secondhand store. Research by UK organization WRAP found that keeping a garment in active use for just nine additional months reduces both its carbon emissions and water usage by 20-30%.
The math on resale is consistent: the most sustainable garment is one that already exists and keeps getting used.
How the Resale Platforms Differ
The resale market has two primary models, and they serve different seller and buyer needs.
ThredUP is a passive seller model: you ship your clothes to them, they inspect, photograph, list, and sell, and you receive a percentage of the sale (typically 3-80% depending on category and brand). The model favors sellers who want to clear out without managing individual listings.
Poshmark is an active seller model: you photograph and list your own items, set your own prices, and communicate directly with buyers. You retain more control and typically earn a higher percentage, but the time investment is significant.
Both models address the fundamental circular economy problem: the valuable secondhand market for clothing exists, but friction (logistics, trust, photography, pricing) prevents most of it from being transacted. These platforms reduce that friction to the level where the transaction is worth completing, which is the prerequisite for the circular loop to close.
Brand-Run Resale as a Different Proposition
The more interesting development for retailers is brand-operated resale: Patagonia’s Worn Wear, REI’s used gear market, Eileen Fisher’s Renew secondhand program, and Levi’s Second Hand store.
Brand-run resale does something third-party platforms don’t: it keeps the customer relationship within the brand ecosystem. A customer who buys a secondhand Patagonia jacket from Worn Wear is still in Patagonia’s commercial relationship, receiving quality authentication from the brand, and likely to consider new Patagonia gear in the future. A customer who buys the same jacket on Poshmark is not.
The secondary commercial incentive for brand resale is working capital efficiency: brands recovering value from returned, end-of-season, or slow-moving inventory through a resale channel recapture margin from product that would otherwise be written down or destroyed.
The best circular business case for retail brand resale isn’t environmental — it’s that you own the customer relationship throughout the product’s entire useful life. Every competitor you prevent from capturing that resale relationship is a retention argument.
The PrettyLittleThing Complication
PrettyLittleThing launching a resale marketplace (a fast fashion brand enabling secondhand sales of its own rapidly disposable products) has attracted criticism as greenwashing.
The criticism has merit. If a brand’s primary business model produces garments designed to be worn a handful of times and discarded, a resale platform attached to that business doesn’t close the circular loop. It potentially extends the reputational runway for a model that’s fundamentally inconsistent with circular economy principles.
The honest test: is the brand also changing how products are designed and made to last longer? If yes, resale reinforces a genuine shift. If no, resale is a communications strategy layered on an unchanged linear model.
P.S. For retailers considering brand-operated resale, the operational question that determines financial viability is return rate and quality control: what percentage of resale inventory can actually be sold at a margin that justifies the program cost? Most successful programs require 60%+ sellable inventory from returns to break even.