What Is CO₂e in Fashion? (Definition & Why It Matters)

If you care about sustainable fashion, you’ve probably seen the term “CO₂e” popping up more and more in reports, campaigns, and brand claims. Yet most of us were never taught what CO₂e actually is, how it’s calculated, or why it matters more than a pretty green hangtag.

In this guide, we’ll answer the question “what is CO2e in fashion?” in simple language and connect it to the clothes already hanging in your wardrobe. We’ll unpack the clothing carbon footprint from fibre to end‑of‑life, look at cotton vs polyester, and share practical ways to reduce the CO₂e impact of your existing wardrobe not just your next purchase.

Understanding CO₂e: A Simple Definition for Fashion

CO₂e stands for “carbon dioxide equivalent”. It’s a way of adding up all the different greenhouse gases (like methane and nitrous oxide) and expressing them as if they were just one gas: carbon dioxide. That makes it easier to compare the climate impact of different products, from T‑shirts to trainers, on a level playing field.

When you see CO₂e on a fashion label or in a report, think of it as a single number describing the total climate impact of a garment over a defined scope. In other words, fashion CO₂e explained in one sentence is: the amount of warming pollution a piece of clothing is responsible for, measured in kilograms or tonnes of CO₂e.

This is different from vague language like “eco‑friendly”, “green”, or “conscious collection”. CO₂e calculation in clothing is based on measurable data and recognised methods, not just good intentions. That’s why more climate‑serious brands, auditors, and policymakers are shifting their focus from marketing adjectives to hard numbers.

How CO₂e Is Calculated Across a Garment’s Life Cycle

To understand the clothing carbon footprint properly, you have to zoom out and look at the full garment life cycle emissions. Most lifecycle assessments for fashion include at least these stages:

1. Raw materials and fibre production
   

• Growing cotton, extracting oil for polyester, processing wood pulp for viscose, or producing other fibres.
  

• Includes fertiliser, pesticides, irrigation, and energy used in processing.
  

2. Spinning, knitting, and weaving
   

• Turning fibres into yarn and fabric.
  

• Electricity mix and machinery efficiency make a big difference here.
  

3. Dyeing, finishing, and treatments
   

• Colouring the fabric, adding performance finishes (like water repellence), pre‑shrinking and softening.
  

• These wet processes are some of the most energy‑ and chemical‑intensive parts of the supply chain.
  

4. Cut‑and‑sew garment manufacturing
   

• Cutting patterns, sewing, trimming, pressing, and packing the finished garment.
  

• The CO₂e here depends on factory energy sources and efficiency.
  

5. Transport and distribution
   

• Moving clothes from factories to warehouses, then to stores or your front door.
  

• This includes ships, planes, trucks, and last‑mile delivery.
  

6. Use phase
   

• Washing, drying, ironing, repairs, and how long you keep the item in active rotation.
  

• For some garments, this can rival production emissions.
  

7. End‑of‑life
   

• Resale, rental, donation, recycling, down‑cycling, incineration, or landfill.
  

• Different pathways carry very different CO₂e outcomes.
  

To calculate fashion CO₂e, analysts collect data on energy use, fuel, materials, and waste for each stage, then apply emission factors (standard numbers that say “X unit of this activity = Y kg CO₂e”). Summed together, this gives the total CO₂e calculation in clothing for that garment or product line.

The important thing for consumers is not memorising the maths, but understanding the pattern: most emissions come from materials and manufacturing, not from shipping, and use‑phase behaviour can significantly shift the final total.

Where Most Clothing Emissions Actually Come From (Hint: Not Shipping)

When people imagine the climate impact of fashion, they often picture planes and container ships carrying garments around the world. Transport does matter but for most clothes, it’s a surprisingly small slice of the pie.

Studies show that shipping and transport typically account for only a few percent of a garment’s total CO₂e. The bigger hotspots are:

• Fibre production – especially when it relies on fossil fuels, intensive fertilisers, or deforestation risks.
  

• Dyeing and finishing – because heating large volumes of water requires a lot of energy, often from coal or gas.
  

• Electricity for factories – which can be very high‑carbon in regions reliant on coal‑heavy grids.
  

That means moving a garment’s production from one country to another doesn’t automatically slash its clothing carbon footprint. A T‑shirt made in a coal‑powered local factory can emit more CO₂e than one made in a highly efficient, renewable‑powered overseas plant, even after shipping is included.

The takeaway: if you want low carbon fashion choices, don’t just look at how far something travelled. Look for information about materials, processes, and energy sources across the garment life cycle emissions.

CO₂e and Fabric Choice: Cotton, Polyester, and Other Common Fibres

One of the biggest drivers of CO₂e in fashion is the fibre itself. Different materials carry different climate profiles from the moment they’re created.

Cotton

Conventional cotton is a natural fibre, but that doesn’t automatically make it low‑carbon. Its CO₂e can be high because of:

• Heavy fertiliser and pesticide use.
  

• Irrigation and water pumping.
  

• Energy‑intensive ginning and processing.

Better‑practices cotton, organic cotton, and regenerative approaches can reduce some impacts, but they’re not one simple solution. When we talk about the CO₂e breakdown of a cotton T‑shirt vs polyester, we must consider how and where the cotton is grown and processed.

Polyester and other synthetics

Polyester is made from fossil fuels. Its upstream CO₂e comes from:

• Extracting and refining oil or gas.
  

• Polymer production and spinning.
  

• Energy‑intensive processing, often in coal‑reliant regions.
  

Polyester tends to have higher production emissions per kilogram than many natural fibres. It also creates additional problems in the form of microplastics when washed and worn. Recycled polyester reduces demand for new fossil feedstock, but it usually doesn’t eliminate the microplastic issue and still requires energy to produce.

Other fibres

• Viscose / man‑made cellulosics: Derived from wood pulp; carbon impact depends on forestry practices, chemicals, and energy mix.
  

• Wool: Biodegradable, but methane from sheep can make wool relatively high‑CO₂e unless managed carefully.
  

• Linen, hemp, and bast fibres: Often lower‑input and potentially lower‑carbon, though processing still matters.
  

Choosing lower‑impact fibres is one piece of the low carbon fashion choices puzzle but it doesn’t replace the need to buy less, wear longer, and care better for what you own.

CO₂e in Use: Washing, Drying, Repairing, and Rewearing Clothes

The carbon footprint of washing and drying clothes at home can be surprisingly significant over the life of a garment. For items that are frequently washed (like T‑shirts or underwear), use‑phase emissions can rival or exceed production emissions, especially when:

• Washing machines are run at high temperatures.
  

• Tumble dryers are used frequently.
  

• Irons and steamers are used every time.
  

To cut CO₂e in the use phase:

• Wash at cooler temperatures and only when needed.
  

• Line‑dry whenever possible instead of tumble drying.
  

• Spot‑clean and air garments to extend time between washes.
  

• Choose durable garments that stay in your wardrobe for many years.
  

Repairs also matter for garment life cycle emissions. Extending the life of a piece by even 9–12 months can significantly reduce its annualised CO₂e impact, because the emissions from production are spread over more wears.

Ultimately, thinking about “CO2e calculation in clothing” needs to include your own habits. Even the greenest garment will have a higher carbon footprint than necessary if it’s over‑washed, under‑worn, and quickly discarded.

End‑of‑Life CO₂e: Resale, Recycling, Donation, and Landfill

What happens when you’re done with a garment can either lock in more emissions or help avoid them.

• Resale and peer‑to‑peer platforms
  

• When someone else buys your used item instead of something new, you help avoid the CO₂e of producing a replacement.
  

• This works best for high‑quality items that still have a long functional life.
  

• Rental and subscription models
  

• Can reduce demand for new production if they replace frequent new purchases, especially in occasion‑wear and maternity categories.
  

• Repair, upcycling, and alteration
  

• Turning something you already own into “new to you” extends its lifetime and lowers its annual carbon footprint.
  

• Mechanical or chemical recycling
  

• Still limited in scale and often fibre‑specific, but can reduce the need for virgin materials.
  

• Many recycling schemes today are down‑cycling (e.g., turning clothes into rags or insulation), which can save some emissions but doesn’t fully close the loop.
  

• Incineration and landfill
  

• Usually the worst options from a climate perspective, especially when materials are synthetic or heavily treated.
  

If you’re wondering how to reduce the CO₂e impact of your existing wardrobe, focusing on resale, repair, and thoughtful donation is often more impactful than simply buying a pile of new “sustainable” pieces.

How to Use CO₂e to Make Better Fashion Decisions

So how can you turn all of this into real‑world low carbon fashion choices, without a PhD in data?

Here are practical steps:

1. Prioritise wearing what you already own
   

• The lowest‑carbon garment is usually the one in your wardrobe.
  

• Create new outfits by styling existing pieces differently.
  

2. Buy less, buy better
   

• Choose garments you’ll wear at least 30+ times.
  

• Focus on fit, repairability, timelessness, and versatility.
  

3. Look beyond “eco” labels
   

• Seek brands that publish fashion CO₂e explained in plain language, with numbers and boundaries (e.g., cradle‑to‑gate vs cradle‑to‑grave).
  

• Be wary of claims that rely only on recycled polyester or organic cotton with no discussion of overall garment life cycle emissions.
  

4. Favour lower‑impact fabrics where possible
   

• For basics, consider better‑practices cotton, linen, or other lower‑input fibres.
  

• Reserve synthetics for performance needs where they truly add value, and wash them less often in full loads with microfibre filters if possible.
  

5. Change how you wash and dry
   

• Wash cool, line‑dry, and skip unnecessary ironing.
  

• This directly reduces your personal clothing carbon footprint.
  

6. Support repair, resale, and take‑back schemes
   

• Use alterations and mending to extend life.
  

• Resell or pass on good‑quality pieces instead of binning them.
  

7. Use CO₂e labels as a comparison tool, not a guilt trigger
   

• If two similar garments are available, choose the one with lower CO₂e especially when it also scores well on durability and ethics.
  

• Remember that the biggest shift comes from buying fewer, better pieces overall.
  

Thinking in CO₂e turns sustainability from a vague feeling into a practical framework. It helps you ask sharper questions, such as: is this “conscious” dress actually lower‑carbon than my existing one, or just better marketed?

FAQs About CO₂e in Fashion

1. Why do different brands report different CO₂e numbers for similar garments?
CO₂e numbers depend on boundaries (what’s included), data quality, and assumptions. One brand may count cradle‑to‑gate (up to factory exit), while another includes use and end‑of‑life. Always check what’s covered before comparing.

2. Is CO₂e an exact measurement?
No. CO₂e is an estimate based on the best available data and emission factors. It’s not perfect, but it is a useful decision‑making tool much more informative than generic “green” labels.

3. How much CO₂e does the fashion industry produce every year?
Estimates vary, but fashion is consistently shown to be responsible for a significant share of global greenhouse gas emissions. What matters for you is how you influence that number through what you buy, how you care for clothes, and how long you keep them.

4. Is it better to buy a new low‑CO₂e item or keep a high‑CO₂e one I already own?
In most cases, continuing to wear what you own is best. The production emissions have already happened, so extending the garment’s life spreads that impact over more wears and avoids the footprint of making something new.

5. Does local production always mean lower CO₂e?
Not necessarily. If local factories use high‑carbon energy, a garment made closer to home can still have a higher clothing carbon footprint than one made overseas in a cleaner, more efficient facility. You need to look at the whole garment life cycle emissions, not just geography.

6. Are second‑hand clothes always low‑carbon?
Buying second‑hand usually has a much lower CO₂e impact than buying new, especially when it replaces the purchase of new items. However, if resale is used as an excuse to over‑consume, the climate benefits shrink.

Understanding what CO2e is in fashion turns sustainability from something abstract into something you can actually work with. Instead of chasing every new “eco” drop, you can focus on the metrics that matter: clothing carbon footprint, garment life cycle emissions, and the real‑world behaviour that shrinks them.

You don’t need perfect information to start. By wearing what you have, buying fewer but better pieces, washing and drying with care, and supporting brands that share honest CO₂e data, you’re already making low carbon fashion choices that cut through the noise.

Fashion will not solve the climate crisis alone but a carbon‑literate wardrobe is a powerful place to begin.

Ready to Build a Lower‑Carbon Wardrobe?

If this guide has helped you understand what CO₂e in fashion really means, the most powerful next step is choosing clothes designed to be worn, loved, and kept in circulation for longer. 

At No More Nobody, we don’t claim to have solved fashion’s carbon problem and we won’t pretend we’re “net zero” overnight. What we can say is this: we are actively working on it. We prioritise natural fibres and use organic cotton wherever possible. We produce in small batches to avoid overproduction. We work with rescued and deadstock fabrics to reduce the need for virgin materials. We design for longevity, not landfill.

We are learning. We are measuring. We are asking harder questions about our own garment life cycle emissions. And as our knowledge deepens, so do our standards. Sustainability isn’t a finished destination for us it’s an ongoing commitment. The more carbon literate we become, the more responsibly we can serve our community and our industry.

Progress over perfection. Transparency over greenwashing. Action over aesthetics.

We’re building this better, step by step.

Now, explore our consciously designed pieces in the No More Nobody circular womenswear collection and start building a wardrobe that respects both craft and climate.

Written by Monisha Hasigala Krishnappa