Decoding Your Fabric Label: Understanding What It Really Tells You
A Guide to Reading Care Labels
5/10/20263 min read
THE CARE LABEL DECODER
5 Things Your Fabric Label Is Not Telling You
A practical guide from Fabrics Vetted
THE ONE RULE THAT REPLACES EVERYTHING
Find the care label sewn into the seam of any garment. Read the fiber content list. The first fiber listed is the dominant one. That fiber defines the biological profile of what is touching your skin.
Everything else on the hangtag, the brand website, and the marketing copy is doing work for the minority fiber. The care label is the only document on the garment that federal law requires to be accurate.
1. THE SYNTHETIC FIBERS TO WATCH FOR
If any of these leads the fiber content list, the garment has a synthetic biological profile regardless of what the marketing says.
Polyester / PET A petroleum derivative. Same polymer as a plastic water bottle. Releases microplastic particles under heat and friction.
Nylon / Polyamide A petroleum-derived synthetic. Similar shedding profile to polyester. Common in activewear and outerwear.
Acrylic Petroleum-based. The highest microplastic shedding rate of the common synthetics. Common in sweaters and knitwear.
Elastane / Spandex / Lycra A synthetic polyurethane fiber. Does not biodegrade. Even at 2 percent of a blend, prevents the garment from being recycled or composted at end of life.
2. THE NATURAL FIBERS TO LOOK FOR
If any of these leads the fiber content list, the next question is what certifications are on the label.
Organic Cotton Look for GOTS certification on the physical label, not just the hangtag. GOTS prohibits PFAS, heavy metals, endocrine disruptors, and formaldehyde across the supply chain.
Linen Made from flax. Naturally breathable and biodegradable. Minimal processing chemistry required.
Wool Look for the Responsible Wool Standard (RWS) for verified ethical sourcing. Wool is naturally thermoregulating and biocompatible.
TENCEL / Lyocell A wood-derived cellulose fiber processed in a closed-loop system with non-toxic solvents. The cleanest cellulosic fiber currently available at commercial scale.
Hemp Naturally pest-resistant, requires minimal water, biodegradable. Often blended with cotton or linen.
3. THE CERTIFICATIONS THAT ACTUALLY MEAN SOMETHING
GOTS (Global Organic Textile Standard) The most rigorous textile certification available. Requires 95 percent organic fiber content for the "organic" label, 70 percent for "made with organic." Covers the entire supply chain including dyes and finishing chemicals.
OEKO-TEX Standard 100 Tests finished garments for over 100 harmful substances. A complementary certification to GOTS. A garment can be OEKO-TEX certified without being organic — the standard is about chemical safety of the finished product.
Responsible Wool Standard (RWS) Verified ethical wool sourcing. Animal welfare and land management criteria.
If a hangtag uses the word "organic" or "sustainable" without one of these certifications named on the physical care label, treat the claim as unverified marketing.
4. THE BLEND TRAP
A garment can be 90 percent polyester and 10 percent organic cotton and legally carry a "made with organic" claim on the hangtag.
The organic cotton is real. The synthetic profile of the garment is also real. The dominant fiber wins.
Rule: The first fiber listed on the care label is what defines the garment. Anything below it in the list is a minority component doing marketing work.
5. THE 30 SECOND TEST
Before buying anything, do this:
Locate the care label. It is sewn into the seam, not attached as a hangtag.
Read the fiber content list. Note the first fiber.
If synthetic, the garment is synthetic. Decide if that is acceptable for the use case.
If natural, check for a certification name printed on the same label or a separate sewn certification tag.
If no certification appears, the claim is unverified marketing.
That is it. 30 seconds. More accurate than every hangtag claim ever printed.
ONE LAST THING
This guide is the starting point, not the complete picture. The full conversation includes fiber length, processing chemistry, recycled versus virgin synthetics, dye safety, and the biological mechanisms behind chronic textile exposure.
For weekly insights on what is actually in your wardrobe and what to do about it, the Fabrics Vetted platform covers it all.