100% cotton clothing

What 100% cotton means (and what it does not)

A garment labeled 100% cotton contains cotton fiber and no other fiber. No polyester for durability, no elastane for stretch, no modal for softness. It is a pure fiber content claim. What it does not tell you: Conventional vs organic — conventional cotton is one of the most pesticide-intensive crops in agriculture. Roughly 16% of the world's insecticides and 7% of pesticides are applied to cotton. A 100% cotton garment made from conventional cotton was grown with significant chemical inputs. Staple length — the length of the cotton fiber affects quality. Long-staple cotton (Egyptian, Pima, Supima) produces a finer, smoother, stronger yarn than short-staple cotton. Both can be labeled 100% cotton. Dyeing and finishing — the fabric can be dyed with synthetic dyes or finished with chemical treatments and still carry a 100% cotton label. OEKO-TEX certification addresses this; the cotton label alone does not. Origin — the label does not state where the cotton was grown or where the garment was made unless additional labeling is included.

How to read clothing labels

Clothing labels in most countries are required to state fiber content by percentage. Reading them accurately: "100% cotton" — pure cotton, no other fiber content. "Cotton 95%, elastane 5%" — a cotton-blend with stretch. Common in fitted garments. The 5% elastane means the garment sheds microplastics when washed and will not biodegrade fully. "Cotton 60%, polyester 40%" — a significant synthetic blend. Often found in cheaper garments. Breathes less well, sheds more microplastics, lasts shorter. "Organic cotton" without a certification mark — the brand is making a claim with no third-party verification. Ask for the certification body. "GOTS certified organic cotton" with a certification number — a verifiable claim. The certification number can be checked at the GOTS database. Care labels and fiber content are legally required in most markets. Country of manufacture is also typically required but may appear separately from the fiber label.

Why cotton blends are common and what you lose

Cotton blends dominate mass-market clothing because they are cheaper to produce and easier to manufacture than pure cotton. The most common additions and their purposes: Polyester — added to reduce cost, increase wrinkle resistance, and improve colorfastness. Makes fabric feel slightly slicker. Reduces breathability, adds synthetic microplastic shedding, and degrades more quickly than pure cotton in terms of hand feel. Elastane/spandex — added for stretch in fitted garments. Even 2 to 5% elastane makes garments significantly stretchier. The tradeoff: elastane degrades faster than cotton (the stretch eventually goes), and the garment cannot be composted or fully recycled because the fibers cannot be separated. Modal/lyocell — cellulose fibers added for softness. These are wood-pulp-based synthetics that are softer than cotton but less breathable. They do biodegrade, so blending with these is less problematic than with petroleum-based synthetics. For longevity and environmental performance, 100% cotton outperforms most blends. The exception is high-quality linen-cotton blends, which can combine good breathability with a natural hand, but are not common in the mass market.

Organic cotton: what GOTS certification covers

GOTS — Global Organic Textile Standard — is the most widely recognized certification for organic cotton clothing. It covers two main areas: Farming — the cotton must be grown without synthetic pesticides, synthetic fertilizers, or genetically modified seeds. At least 70% of the fiber content must be certified organic to use the GOTS label (95% or more for the "organic" label tier). Processing — GOTS restricts harmful chemicals in all subsequent steps: dyeing, bleaching, printing, and finishing. Wastewater from certified facilities must meet treatment standards. This is significant because conventional textile processing uses many chemicals that farming certification alone does not address. GOTS also requires social compliance: minimum labor standards, prohibition of child labor, safe working conditions. The result: a GOTS-certified garment is clean throughout its supply chain — from seed to finished product. It is the most thorough certification available for cotton clothing and significantly more credible than a brand's own "organic" claim.

How to care for 100% cotton clothing

Cotton is forgiving and machine washable, but a few practices extend garment life significantly: Wash cool — 30 to 40°C is sufficient for most everyday washing and causes less shrinkage and fiber stress than hot water. Reserve hot water for heavily soiled items. Turn inside out — reduces surface abrasion and fading, particularly on dark colors. Most color loss in cotton comes from friction in the drum, not detergent. Avoid over-drying — remove from the dryer while slightly damp or line dry. Over-drying causes shrinkage and makes fibers brittle over time. Cotton that has been line dried and ironed or steamed while damp looks better and lasts longer. No fabric softener on cotton — softener coats fibers, reducing cotton's natural moisture-wicking properties. It is unnecessary on well-washed cotton, which softens naturally. Store clean — cotton is susceptible to silverfish and some moths when soiled. Wash before storing for any length of time. Unlike wool, cotton does not need cedar or moth protection in normal storage.

Every brand in The Plain Thread directory uses natural fibers. Browse organic cotton clothing brands with transparent sourcing.