Clyn — Journal
Slow Fashion Reference Guide
The Language of Slow Fashion: A Glossary
Slow fashion has its own vocabulary. Terms that appear across brand websites, sustainability reports, magazine features and social media captions — sometimes used precisely, sometimes loosely, sometimes as marketing language that has drifted from its original meaning.
Understanding this vocabulary is not a prerequisite for dressing thoughtfully. But it helps. It allows you to assess claims more accurately, ask better questions, and hold a clearer picture of what the brands you buy from are — and are not — actually doing.
This glossary aims to define the terms honestly — including where they are contested, where they are commonly misused, and where the gap between the word and the reality is widest.
How to use this glossary: Terms are listed alphabetically within each letter section. Where a term is frequently misused or used as greenwashing language, this is noted. Where Clyn has a specific position on a term — because it is directly relevant to how we design or describe our garments — this is noted too.
B
B-Corp certification
A certification awarded to companies that meet rigorous standards of social and environmental performance, accountability and transparency. B-Corp assesses the whole business — not just a product or a supply chain element — across five areas: workers, community, environment, customers and governance. It is one of the most comprehensive business-level sustainability certifications available and harder to obtain than most product-level certifications. Worth looking for as a brand-level signal, though it measures performance rather than perfection.
Biodegradable
A material that can be broken down by microorganisms into natural substances over time. Natural fibres — wool, cotton, linen, silk — are generally biodegradable. Synthetic fibres — polyester, nylon, acrylic — are not, or biodegrade so slowly as to be functionally permanent. The term requires context: a biodegradable garment buried in a landfill will not biodegrade meaningfully due to lack of oxygen. Biodegradability is a genuine property but not, alone, a sustainability credential.
Commonly misused: biodegradable packaging described as a sustainability achievement by brands whose garments are non-biodegradable synthetics.
Bracketing
The practice of ordering multiple sizes or versions of the same garment with the intention of keeping one and returning the rest. Widespread in online fashion shopping, particularly for trousers, because size inconsistency across brands makes single-size ordering unreliable. A symptom of the industry's fit problem rather than a consumer behaviour problem. See also: return rate.
C
Capsule wardrobe
A deliberately edited collection of versatile, timeless pieces that work together and can be supplemented with seasonal additions. The concept was introduced by London boutique owner Susie Faux in the 1970s. A capsule wardrobe is not a fixed number of pieces or a prescribed list — it is a framework for building a wardrobe around pieces that are genuinely worn rather than aspirationally owned. Closely aligned with slow fashion values but distinct from minimalism, which implies a specific aesthetic as well as an editing philosophy.
Carbon footprint
The total greenhouse gas emissions produced by an activity, product or organisation, expressed as an equivalent amount of carbon dioxide. The fashion industry's carbon footprint is estimated at around 10% of global emissions annually — more than aviation and shipping combined. A garment's carbon footprint includes the growing or production of its fibres, its manufacturing, its transportation and its end-of-life disposal. Brands claiming carbon neutrality should be able to explain specifically how they have measured and offset their emissions.
Watch for: carbon offsetting presented as equivalent to emissions reduction. Offsetting is a partial mitigation, not a solution.
Circular fashion
A design and production approach that keeps materials in use for as long as possible, eliminates waste, and enables garments to be repaired, resold, recycled or composted at the end of their useful life. Circular fashion challenges the linear model — make, use, dispose — that has defined fashion production since industrialisation. True circular fashion requires design decisions made at the outset of a garment's life that enable its eventual recovery: natural fibres that can be composted, construction that allows disassembly, no mixed fibre content that prevents recycling.
Considered design
Design that begins with a question about purpose rather than aesthetics — asking what the garment needs to do, for whom, and across what duration of use, before asking what it should look like. In trouser design specifically, considered design means addressing fit, proportion, fabric and construction as primary design criteria rather than secondary ones. At Clyn, considered design is the working standard applied to every decision in the pattern, fabric and construction of our trousers.
Cost per wear
The actual cost of wearing a garment calculated by dividing its purchase price by the number of times it is worn. A £150 trouser worn 200 times has a cost per wear of 75 pence. A £40 trouser worn 8 times has a cost per wear of £5. Cost per wear is the most practically useful metric for assessing the value of a clothing purchase and the strongest financial argument for slow fashion investment pieces over fast fashion replacements.
E
Ethical fashion
Fashion that considers the social and human dimensions of production — the conditions under which garments are made, the wages paid to the people who make them, the safety of the manufacturing environment. Ethical fashion is distinct from sustainable fashion, which is primarily concerned with environmental impact, though the two are closely related and often addressed together. A garment can be made from environmentally sustainable materials and be produced under exploitative labour conditions. Both dimensions require assessment.
F
Fairtrade
A certification system that ensures producers in developing countries receive fair prices and decent working conditions. In fashion, Fairtrade certification applies primarily to cotton growers and some other fibre producers. It does not cover all stages of the supply chain. A Fairtrade cotton garment has been made from fairly traded fibre — its manufacturing conditions are a separate question.
Fast fashion
A business model that prioritises the rapid production of high volumes of trend-led clothing at low price points. Fast fashion compresses the production cycle from concept to retail to days or weeks rather than months. It relies on low-cost manufacturing, synthetic materials and trend obsolescence to drive repeat purchasing. The fast fashion model is the primary driver of fashion's environmental impact and of the fit problems most women experience — because speed and volume are structurally incompatible with the considered pattern development that genuine fit requires.
Fit
The relationship between a garment and the body wearing it — whether the garment sits correctly at every measurement point across the full range of movement the wearer requires. In trouser design, fit is determined by the pattern and the grading, not by the fabric or the price. A trouser that fits correctly requires no adjustment, creates no awareness of its presence, and behaves consistently from the start of a day to the end. At Clyn, fit is not a feature. It is the purpose.
G
Grading
The process of scaling a pattern from the size at which it was developed (the sample size) to produce the full size range. Standard grading scales all measurements proportionally — which is why it fails women whose proportions diverge from the sample size assumptions. Considered grading scales different measurements at different rates to account for how bodies actually change across the size range, rather than how a mathematical formula predicts they should. See also: sample size, waist-to-hip differential.
Greenwashing
The use of environmental or ethical language to create an impression of sustainability that is not supported by actual practices. Greenwashing ranges from deliberate misrepresentation to the more common practice of highlighting one genuine sustainability credential while obscuring larger unsustainable practices. The most reliable test: ask what specific, verifiable evidence supports the claim. Vague language and absent supply chain information are the most consistent indicators. See Clyn's full guide: What Is Greenwashing in Fashion — And How to Spot It.
Among the most important terms to understand as a conscious consumer. Widely practised, rarely admitted.
GOTS — Global Organic Textile Standard
The leading certification for organic textiles. GOTS-certified garments have been made from fibres grown without synthetic pesticides or fertilisers, processed without harmful chemicals, and manufactured under socially responsible conditions. GOTS is one of the most comprehensive textile certifications available, covering both environmental and social criteria across the supply chain. It applies to the fibre and processing stages — not necessarily to the full brand supply chain.
L
Longevity design
Design that prioritises how long a garment will last and continue to be worn over how it looks in its first season. Longevity design considers fabric durability, construction quality, ease of repair and the timelessness of the design itself. A garment designed for longevity is not the same as a garment designed for durability — a garment can be structurally robust but visually date-led, meaning it survives but is not worn. True longevity design requires both physical durability and design choices that remain relevant across years rather than seasons.
M
Microplastics
Tiny plastic particles shed by synthetic textiles during washing, which pass through wastewater treatment systems and enter the ocean. A single wash of a polyester garment can release hundreds of thousands of microfibres. Microplastics accumulate in marine environments and have been found in fish, drinking water and human tissue. The microplastic problem is one of the most significant environmental arguments for choosing natural fibres over synthetic alternatives in everyday clothing.
Minimalist fashion
An approach to dressing characterised by edited wardrobes, neutral palettes, clean silhouettes and the deliberate avoidance of trend-driven consumption. Minimalist fashion is frequently confused with a specific aesthetic — all black, severe cuts, absence of decoration — but is more accurately understood as a philosophy: choosing fewer things, chosen more carefully, designed to endure. Closely related to slow fashion values but not identical to them. A minimalist wardrobe can be built from fast fashion pieces. A slow fashion wardrobe may contain more visual variety.
O
Overconsumption
The purchase of more clothing than is used or needed — a structural consequence of the fast fashion business model, which is designed to accelerate purchasing through trend cycles, artificial scarcity and pricing that makes discarding seem preferable to repairing. Overconsumption is the root driver of fashion's environmental impact: the sheer volume of garments produced, purchased briefly and discarded is what makes the industry one of the world's most polluting. Slow fashion is, fundamentally, a response to overconsumption.
P
Pattern
The set of template pieces from which a garment is cut — the flat shapes of fabric that, assembled, produce the three-dimensional garment. In trouser design, the pattern is the primary determinant of fit. The pattern encodes every decision about proportion, rise, waist-to-hip differential and ease of movement. A trouser fits because its pattern was designed for the proportions of the person wearing it. A trouser does not fit because its pattern was designed for different proportions and the wearer is an approximation of them. The pattern is where fit is won or lost — before the fabric is cut, before the garment is sewn.
Q
Quiet luxury
An aesthetic and cultural movement characterised by understated, high-quality dressing that communicates wealth and taste through the quality of materials and construction rather than through visible branding or logos. Quiet luxury overlaps significantly with slow fashion values — both prioritise longevity and quality over novelty — but is not identical to them. Quiet luxury is primarily an aesthetic category. Slow fashion is primarily an ethical and environmental one. A garment can be both; many are neither.
R
Recycled materials
Fibres or fabrics produced from pre-existing materials rather than virgin resources. Recycled polyester — often made from plastic bottles — is the most common recycled material in fashion. Recycled wool, recycled cotton and recycled nylon are also produced. Recycled materials reduce the demand for virgin resources and divert waste from landfill. They do not, however, address the problems associated with the materials themselves — recycled polyester still sheds microplastics, recycled synthetics still do not biodegrade.
Useful as one part of a more sustainable material strategy. Not a comprehensive solution to fashion's environmental impact.
Rise
The distance from the crotch seam to the top of the waistband. The rise determines how a trouser sits on the body — whether the waistband sits at the natural waist, below it or above it — and how the trouser moves with the body when sitting, walking or climbing. Front rise and back rise are different measurements and should be considered independently in pattern design. The back rise requires more length than the front to accommodate seated positions. Standard grading often scales both proportionally, which is why trousers that fit standing frequently feel different when sitting.
S
Sample size
The size in which a garment is originally designed and fitted — typically a UK 8 or 10 for mainstream brands, smaller for luxury fashion. The sample size is the size in which the pattern is most precise and the fit most intentional. All other sizes are produced by grading — scaling the pattern from the sample. The further a size is from the sample, the more the grading assumptions affect the fit. Understanding that fashion is designed from the sample outward — not from the customer inward — explains many of the fit failures most women experience.
Slow fashion
A design and consumption philosophy that prioritises quality, longevity and ethical production over speed and volume. The term was coined by sustainability consultant Kate Fletcher in 2007 as a counterpart to fast fashion. Slow fashion involves buying fewer garments, chosen more carefully, made to last longer, from brands that are transparent about how and where they produce. It is not a synonym for expensive fashion, for minimalist fashion or for sustainable fashion — though it overlaps with all three. It is a relationship with clothing characterised by intention, patience and a longer view of value.
Supply chain transparency
The extent to which a brand discloses the full journey of its garments — from raw material to finished product — including the identities and conditions of manufacturers, the origin of fibres, and the processing steps in between. Transparency is one of the clearest signals of genuine sustainability practice: brands with clean supply chains have no reason to conceal them. Opacity — vague descriptions of manufacturing location, no named factories, no information about working conditions — is one of the most consistent indicators of supply chains that do not bear scrutiny.
T
Timeless design
Design that does not reference a specific moment, trend or season — that will be as appropriate and as wearable in five years as it is now. Timeless design is not the same as boring design. It is design that has been freed from the obligation to be new, and can therefore focus entirely on what is right — for the silhouette, the body, the fabric, the long and ordinary duration of a wardrobe that works. Timelessness is a prerequisite for longevity: a garment that dates cannot be worn for years, regardless of how well it was made.
Toile
A test garment sewn in inexpensive fabric — typically cotton calico — to assess the fit and proportion of a pattern before cutting in the final production fabric. The toile is the physical test of the pattern, revealing fit issues that cannot be identified on paper. Multiple toiles are typically made during pattern development, each one incorporating the corrections identified in the previous fitting. The toile process is an essential part of considered garment development and one of the primary reasons slow fashion takes longer to produce than fast fashion.
V
Vanity sizing
The industry practice of labelling garments with smaller size numbers than their measurements technically justify — so that a customer finds a smaller number than expected in the fitting room, associates positive feelings with the brand, and is more likely to purchase. Vanity sizing has inflated UK dress sizes progressively over several decades and is a significant contributor to cross-brand sizing inconsistency. A size 12 today is measurably larger than a size 12 was twenty years ago — and the rate of inflation has not been consistent across brands.
W
Waist-to-hip differential
The difference in centimetres between the waist measurement and the hip measurement. The single most important proportion in trouser fit. Standard trouser grading assumes a differential of approximately 20–23cm and scales uniformly — which means that women with a differential significantly larger than this will find that trousers sized for their hip gap at the waist, and trousers sized for their waist will not pass the hips. At Clyn, the waist-to-hip differential is the central design consideration — the measurement around which every other pattern decision is made.
Wear rate
The frequency with which a garment is actually worn relative to how often it theoretically could be. A high wear rate — a piece reached for multiple times per week — indicates a garment that genuinely works within a wardrobe. A low wear rate indicates a garment that was bought but not integrated — an almost-right piece that failed to earn its place in daily rotation. Wear rate is a more honest measure of a purchase's success than purchase price alone, and closely related to the concept of cost per wear.
Wool crepe
A wool fabric with a slightly textured, matte surface created through a specific weaving and finishing process. Wool crepe is one of the most practical fabrics for tailored trousers — it has excellent structure, good recovery, natural breathability and crease resistance. The texture adds visual depth and disguises minor creasing, making it well-suited to all-day wear. Medium weight wool crepe (180–240gsm) is the standard for quality tailored trousers.
"The language of slow fashion is only useful if it is used honestly. Every word in this glossary can be greenwashed. Every word can also be meant."
At Clyn, we try to use this language precisely — and to say less rather than claim more than we can yet substantiate. If you come across a term in our writing that you would like us to explain more fully, we would like to hear from you.
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