MASTERING GARMENT COSTING IN FASHION: AN EFFECTIVE COST ANALYSIS MODEL APPLIED TO A MAXIMALLY POLLUTING FAST FASHION BRAND AND A NON‑GREENWASHING ECO‑ORIENTED BRAND

EXECUTIVE SUMMARY

This paper argues that conventional garment costing conceals the true cost of fast fashion. To address this, it introduces the Effective Cost Analysis Model (ECAM), which integrates production cost, commercial overhead, environmental and social externalities, regulatory and reputational risk and strategic value. The model is grounded in costing literature, sustainability research and empirical reporting on fast fashion and fair-trade supply chains.

The ECAM is applied to two contrasting business models. The first is a maximally polluting fast fashion brand represented by a SHEIN‑type model characterised by ultra fast production, low prices, high SKU turnover and opaque supply chains. The second is a non‑greenwashing eco‑oriented brand represented by People Tree, a Fairtrade and organic pioneer with transparent supply chains, slower production cycles and long‑standing ethical commitments.

The analysis shows that the fast fashion model appears profitable only when environmental and social externalities and risk exposure are excluded. Once these are included, the effective profit per unit is significantly lower than the accounting profit suggests. The eco‑oriented model, despite higher production and commercial costs, achieves far higher effective profit per unit because it generates lower environmental and social harm, faces reduced regulatory and reputational risk and benefits from stronger strategic value through durability, customer loyalty and brand trust.

The findings challenge the assumption that sustainability undermines profitability. Instead, they demonstrate that pollution and risk are the real costs and that ignoring them creates misleading profit signals. The ECAM provides a framework for brands seeking to integrate environmental responsibility with commercial success and offers a more accurate basis for pricing, sourcing and long‑term strategic planning.

INTRODUCTION

Mastering garment costing is not merely an accounting exercise; it is a strategic act that determines the economic, environmental and ethical trajectory of a fashion brand. In an industry defined by asymmetry—between ultra fast fashion’s speed and scale and the slower, more deliberate practices of eco‑oriented production—the same garment silhouette can embody radically different cost structures, risk profiles and externalities. A T‑shirt is never just a T‑shirt. It is a crystallisation of fibre choices, labour conditions, energy systems, logistics pathways, regulatory exposure and brand identity. To understand its true cost is to understand the political economy of fashion itself.

Traditional costing frameworks focus on direct materials, labour and overheads. They are precise in their arithmetic but narrow in their worldview. They exclude environmental externalities, social impacts, regulatory risk and the strategic value generated by durability and customer trust. As a result, they systematically overstate the profitability of fast fashion and understate the long‑term commercial strength of eco‑oriented models. The Effective Cost Analysis Model (ECAM) developed in this paper addresses these omissions by integrating environmental and social externalities, risk exposure and strategic value into a comprehensive costing framework.

This paper applies the ECAM to two contrasting cases: a maximally polluting fast fashion brand represented by a SHEIN‑type model, and a genuinely eco‑oriented brand represented by People Tree, a Fairtrade and organic pioneer not implicated in major greenwashing controversies. The analysis demonstrates that once environmental and risk costs are internalised, the eco‑oriented model produces significantly higher effective profit per unit than the fast fashion model. This challenges the assumption that sustainability undermines profitability and instead shows that pollution and risk are the real costs that conventional accounting conceals.

LITERATURE REVIEW

The garment costing literature provides detailed methodologies for calculating full manufacturing cost. Islam et al. (2023) emphasise the need for comprehensive costing sheets that capture all inputs, including fabric, trims, labour, utilities and overheads. Industry guides similarly stress the importance of tracking every component to maintain margins and avoid hidden costs. These frameworks, however, remain narrowly focused on direct and indirect production costs and do not incorporate environmental or social externalities.

The sustainability literature highlights the environmental and social harms of fast fashion. Niinimäki et al. (2020) describe the sector’s high emissions, water use and waste, arguing that fast fashion’s business model is structurally incompatible with environmental sustainability. Joy et al. (2012) link fast fashion’s disposability to systemic degradation, noting that rapid trend cycles and low durability encourage overconsumption and waste. Reporting on SHEIN shows rapid growth in absolute emissions and concerns about opaque supply chains and labour conditions, reinforcing the argument that fast fashion externalises environmental and social costs.

By contrast, People Tree is frequently cited in fair trade and sustainable fashion scholarship as a pioneer of integrated social and environmental commitments. Its use of Fairtrade cotton, organic fibres, artisan partnerships and transparent supply chains is well documented. Unlike many large outdoor brands, People Tree has not been a central figure in greenwashing debates, making it a suitable proxy for a genuinely eco‑oriented model.

The literature therefore supports the need for a costing model that integrates environmental externalities, social impacts, risk exposure and strategic value.

THE EFFECTIVE COST ANALYSIS MODEL (ECAM)

The ECAM integrates five components: production cost, commercial overhead, environmental and social externalities, risk cost and strategic value. The model is expressed in full mathematical form as:

Total Effective Cost per garment Cₜₒₜₐₗ = Cₚ + Cₒ + Cₑ + Cᵣ − Vₛ

Where:

Cₚ = Production cost (materials, labour, factory overhead)

Cₒ = Commercial overhead (logistics, marketing, retail, administration)

 Cₑ= Environmental and social externalities (monetised)

 Cᵣ= Risk cost (regulatory, reputational, supply chain volatility)

Vₛ = Strategic value (durability, brand equity, customer loyalty, resale potential)

Fast fashion models minimise  Cₚ and Cₒ while externalising  Cₑ and under-pricing Cᵣ. Eco‑oriented brands accept higher Cₚ and  Cₒ to reduce Cₑ  and  Cᵣ and increase Vₛ.

CONSTRUCTING THE COST MODEL: LINE‑BY‑LINE GARMENT COSTING

Constructing a garment cost model requires moving beyond abstract categories such as “materials”, “labour” and “overheads” and instead tracing each cost component as it accumulates along the production pathway. A garment is not a single cost event but a sequence of transformations: fibre becomes yarn, yarn becomes fabric, fabric becomes panels, panels become a garment and the garment becomes a commercial product embedded in logistics, marketing and retail infrastructures. Each stage carries its own cost logic, and each logic is shaped by the business model in which it sits.

Fast fashion compresses time, quality and accountability to minimise cost at every stage. Eco‑oriented production expands time, quality and traceability to ensure that cost reflects environmental and social commitments. A line‑by‑line costing model makes these differences visible.

Fabric cost is the dominant component of garment cost. Islam et al. (2023) note that fabric can account for fifty to seventy per cent of the FOB price of a basic garment. In a SHEIN‑type model, fabric cost is minimised through the use of conventional cotton or low‑grade synthetics, bulk purchasing and suppliers operating under intense price pressure. In a People Tree‑type model, fabric cost is higher because the brand uses Fairtrade cotton, organic fibres or artisan‑produced textiles.

Fibre‑level environmental impact data deepens this divergence. Conventional cotton is responsible for sixteen per cent of global insecticide use and six per cent of global pesticide use despite occupying less than three per cent of agricultural land. A single conventional cotton T‑shirt can require between 2,500 and 3,000 litres of water. Organic cotton eliminates synthetic pesticides and fertilisers and can reduce water consumption by up to ninety‑one per cent. Fairtrade cotton adds minimum price guarantees and community development premiums. These differences do not appear in conventional costing sheets but materially alter  Cₑ  in the ECAM.

Synthetic fibres introduce different externalities. Polyester is derived from petroleum, emits significant greenhouse gases during production and sheds microplastics during washing. These impacts are rarely monetised in conventional costing but represent substantial environmental burdens.

Trims and accessories follow a similar pattern. Fast fashion sources the cheapest possible components, while eco‑oriented brands use organic, recycled or certified trims and plastic‑free packaging.

Labour cost diverges sharply. Fast fashion minimises labour cost through low wages and weak protections. Eco‑oriented brands work with Fairtrade‑certified factories or artisan cooperatives that pay living wages and operate under stricter standards.

Factory overheads also differ. Fast fashion prioritises speed over quality, reducing inspection time and increasing defect rates. Eco‑oriented production invests in slower sewing speeds, better working conditions and more robust finishing processes.

Commercial overheads diverge as well. Fast fashion benefits from scale, optimised shipping and algorithmic marketing. Eco‑oriented brands operate at smaller scale and invest in narrative‑driven marketing and lower‑impact logistics.

When these line‑by‑line costs are aggregated, the conventional cost structure appears to favour fast fashion. But this comparison is incomplete because it excludes Cₑ, Cᵣ  and Vₛ The ECAM equation makes this explicit:

Total Effective Cost per garment  Cₜₒₜₐₗ = Cₚ + Cₒ + Cₑ + Cᵣ − Vₛ

A line‑by‑line costing model therefore becomes the foundation for a full‑spectrum cost analysis. It reveals where fast fashion suppresses cost through externalisation and where eco‑oriented brands internalise cost through ethical commitments. It also reveals how durability, transparency and customer trust generate strategic value that offsets higher direct costs.

This expanded costing model sets the stage for the comparative analysis that follows. Having established how cost accumulates along the production pathway—and how different business models shape that accumulation—we can now examine how these dynamics manifest in practice. The next section applies the ECAM to two contrasting cases: a maximally polluting fast fashion brand represented by a SHEIN‑type model, and a genuinely eco‑oriented brand represented by People Tree. Through this comparison, the structural differences identified in the line‑by‑line costing model become visible in their economic, environmental and strategic consequences.

FAST FASHION BRAND (SHEIN‑TYPE) VERSUS ECO‑ORIENTED BRAND (PEOPLE TREE‑TYPE)

The SHEIN‑type model represents the extreme end of ultra‑fast fashion: algorithmically driven trend replication, hyper‑accelerated design cycles, vast SKU proliferation and a relentless pursuit of cost minimisation through globalised, opaque supply chains. The People Tree‑type model represents a structurally different paradigm: 

Fairtrade cotton, organic fibres, artisan partnerships, transparent supply chains, slower production cycles and a long‑standing commitment to labour and environmental standards.

The SHEIN‑type model achieves extremely low unit costs by minimising   Cₚ and Cₒ. However, this minimisation is achieved by externalising  Cₑ and underpricing Cᵣ . Environmental externalities associated with conventional cotton, fossil‑fuel‑intensive dyeing, synthetic fibres, rapid obsolescence and high waste volumes are substantial. Social externalities, including low wages, excessive overtime and weak labour protections, further increase Cₑ. Risk cost is also structurally high due to regulatory scrutiny, reputational vulnerability and supply chain opacity. Strategic value is low because garments are not designed for durability or long‑term use.

When these components are integrated into the ECAM, the apparent profitability of the SHEIN‑type model collapses. The accounting gross profit remains high because  Cₚ and  Cₒ are artificially low, but the Total Effective Cost rises sharply once Cₑ and Cᵣ   are included. The effective profit per unit is therefore significantly lower than the accounting profit suggests.

The People Tree‑type model operates according to a fundamentally different cost logic. Production cost is higher due to Fairtrade cotton, organic fibres and certified factories. Commercial overhead is higher due to smaller scale and narrative‑driven marketing. However, these higher direct costs are offset by significantly lower  Cₑ and Cᵣ . Organic and Fairtrade cotton reduces pesticide use, improves soil health and supports equitable labour conditions. Slower production cycles reduce waste. Supply chain transparency reduces regulatory and reputational risk. Strategic value is significantly higher due to durability, ethical identity and customer loyalty.

When evaluated using the ECAM, the higher Cₚ and  Cₒ of the People Tree‑type model are more than offset by lower  Cₑ and  Cᵣ and higher Vₛ. The Total Effective Cost is therefore lower than the accounting cost structure would suggest, and the effective profit per unit is significantly higher than that of the SHEIN‑type model.

DISCUSSION

The ECAM reveals that fast fashion profitability depends on externalising environmental and social costs and under-pricing risk. As carbon pricing, due diligence legislation and extended producer responsibility expand, these externalities will increasingly be internalised. Fast fashion’s apparent profitability is therefore fragile. Eco‑oriented brands that invest in fair labour, organic fibres and durability are effectively pre‑paying future regulatory and reputational costs. Their garments may be more expensive, but their cost per wear is lower, their customer loyalty is higher and their exposure to regulatory shocks is reduced. Mastering garment costing therefore requires integrating environmental externalities, social impacts, risk exposure and strategic value into costing sheets.

CONCLUSION

The comparison between a SHEIN‑type fast fashion model and a People Tree‑type eco‑oriented model shows that once environmental and risk costs are included, the eco‑oriented model is more profitable per unit. This challenges the assumption that sustainability is a financial burden. Instead, it demonstrates that pollution and risk are the real costs and that ignoring them creates misleading profit signals. The ECAM provides a framework for brands seeking to align environmental responsibility with commercial success and offers a more accurate basis for pricing, sourcing and long‑term strategic planning.