Unravelling the True Costs of Fast Fashion

 

The product that costs more than you think

Have you ever found a trendy sweater on Shein or in Zara at a surprisingly low price? You're not alone. People are buying more clothes than ever and the fast fashion industry has grown considerably to meet that demand. Shein alone churns out 10,000 new designs a day (McKinsey, 2025). You might wear that sweater a few times before it goes out of fashion or ends up in a landfill. But have you ever stopped to consider the hidden costs behind that bargain, such as the ones these companies don't show you on the price tag?

While the price tag accounts for fabric, stitching and shipping, it fails to capture the environmental and social fallout of production. Economists call these negative externalities. These are hidden costs that third parties are forced to pay, even though they did not agree to.

 

The scale of externalities is enormous

Some one million deaths annually from pollution-related illnesses (World Health Organisation, 2023); 93 billion cubic metres of water consumed each year (Oxfam, 2023; An 83% decline in freshwater species since 1970, driven in part by toxic dye runoff that turns rivers orange and poisons ecosystems. And these facts will never appear on the price tag.

To put the water figure in perspective, consider AI which is currently a hot topic for its own water consumption. AI is projected to use 6.6 billion cubic metres of water per year by 2027 (Better Planet Education, 2025). The fashion industry uses more than fourteen times that amount. Suddenly, the AI industry's water consumption looks minimal by comparison.

 

Why these externalities persist

So, if the damage is this severe, why hasn't the market corrected itself? Why don't consumers simply choose more sustainable options and punish the polluters?

The answer lies in a second form of market failure: asymmetric information. These hidden costs continue because consumers cannot see them. Producers know the true environmental cost of their clothes. However, the consumer sees only a stylish design, an attractive price and perhaps a "sustainable" label. This information imbalance prevents the market from self-correcting.

 

How bad clothes drive out good ones

Economist George Akerlof's famous "Market for Lemons" theory explains exactly what happens when this kind of information asymmetry occurs.

Imagine two shirts that look the same online. One uses real organic cotton. The other is cheap polyester with misleading ‘green’ marketing. When shopping, you see the same beautiful pattern, the same colours, the same feeling of wearing it. You cannot tell them apart.

Since you can't tell which is better, you won't pay extra for something that might be a “lemon”. Rationally, you offer an average price:

Expected value = (Q x “lemons price”) + ((1-Q) x “peaches price”)

The lemon seller is delighted. They've earned a huge profit on a cheap product. But the peach seller is losing money because their genuinely sustainable materials cost more than this average price. Eventually, peach sellers will leave the market. This is adverse selection: low-quality goods systematically drive out high-quality ones and the market declines.

 

When lemons dress up as peaches

This theoretical framework perfectly predicts actual brand behaviour in the premium high-street sector, where information asymmetry is often manipulated through clever marketing.

Consider Massimo Dutti, a premium brand within the Inditex group (Zara's parent company). A recent garment visibly featured a "100% RCS Certified Recycled Polyester" label. Sounds impressive, but is it? That recycled material was used only for the internal lining. The outer layer, comprising 13% polyamide and elastane, consisted entirely of raw petrochemicals. Most of the £150 budget went to wool. So, the brand used cheap recycled polyester for the lining just to claim a "100% Recycled" label, without hurting its profits. This is a textbook lemon disguised as a peach.

 

 

What a peach looks like

If Massimo Dutti shows how a lemon disguises itself as a peach, then TOAST demonstrates what a peach strategy looks like and how brands can survive adverse selection through radical material honesty.

According to TOAST's 2024 Materials Tracker, 92% of their products fall into high-tier categories, prioritising natural, biodegradable fibres over petrochemical derivatives. This shift to natural materials fundamentally reduces supply-chain externalities, generating significantly fewer toxic outputs and emissions during the growing process compared to synthetic manufacturing.

 

Downcycling disguised as sustainability

The greenwashing problem extends beyond individual brands to the industry's favourite sustainability concept, which is converting disposed of plastic bottles into garments. This story sounds convincing, but it is misleading.

Plastic bottles are capable of bottle-to-bottle recycling. They can be recycled back into new bottles easily. But once the plastic is turned into polyester fibre, it can never be recycled again. It ends up in a landfill or is burned. Worse still, these garments continuously shed microplastics into waterways every time they are washed.

Transferring plastic waste into the clothes supply chain is not recycling, it is downcycling. It provides a compliance rationale for fast fashion's overproduction model rather than addressing resource waste at its source. Brands get "green" labels cheaply with recycled linings. This let’s profit from green marketing pushing out of truly sustainable companies.

 

What the item really costs

Let's return to that trendy sweater. Its true cost includes polluted water, lost wildlife, and people suffering health problems caused by fashion companies' pursuit of profit. These negative externalities persist because asymmetric information shields them from consumer view, creating a market for lemons where the cheapest products dominate and sustainable brands are driven out.

True sustainability in fashion requires two shifts. Firstly, transparency over greenwashing. Requiring brands to reveal their full supply-chain environmental impact, not selective certification of a garment's cheapest component.

 

Secondly, natural fibres over downcycled synthetics. Prioritising biodegradable materials and extending garment durations, rather than turning industrial waste into disposable trends.

The next time you pick up a sweater, ask yourself: What is the true cost of this? And consider if the price is truly a bargain.

References

 

Abelvik-Lawson, H. (2023). Fashion greenwash: How companies are hiding the true environmental costs of fast fashion. [online] Greenpeace. Available at: https://www.greenpeace.org.uk/news/fashion-greenwash-report-companies-hiding-true-environmental-costs-fast-fashion/. 

Better Planet Education (2025). Water Usage. [online] Betterplaneteducation.org.uk. Available at: https://betterplaneteducation.org.uk/factsheets/water-usage. 

Hale, E. (2024). Green fashion: Why dyeing clothes has a big environmental impact. BBC News. [online] 5 Nov. Available at: https://www.bbc.co.uk/news/articles/c870j92p82wo. 

Levin, J. (2001). Information and the Market for Lemons. The RAND Journal of Economics, 32(4), p.657. doi:https://doi.org/10.2307/2696386. 

Massimodutti.com. (2026). Available at: https://www.massimodutti.com/gb/halter-neck-midi-dress-with-tie-detail-l06655508?pelement=58860507&banner=true [Accessed 23 Apr. 2026].

McKinsey & Company (2025). What Is Fast Fashion? [online] McKinsey & Company. Available at: https://www.mckinsey.com/featured-insights/mckinsey-explainers/what-is-fast-fashion. 

Rice, L. (2025). Buying second hand clothes: What are the benefits? [online] Oxfam GB. Available at: https://www.oxfam.org.uk/oxfam-in-action/oxfam-blog/buying-second-hand-clothes-what-are-the-benefits/. 

Ritch, E. (2025). Fast fashion: what are the true costs? [online] Economics Observatory. Available at: https://www.economicsobservatory.com/fast-fashion-what-are-the-true-costs. 

Social Conscience Report 2024 Image by Jo Metson Scott. (n.d.). Available at: https://cdn.shopify.com/s/files/1/0282/5050/5250/files/Social_Conscience_Report_2024.pdf?v=1745483028. 

World Health Organization (2023). Drinking-water. [online] World Health Organization. Available at: https://www.who.int/news-room/fact-sheets/detail/drinking-water.