The Fabric FilesWhat your clothes are actually made of

2026-09-14 - The Fabric Files

How to read a fabric label like a buyer

Every garment tells you what it is on the inside seam. Learning to read that label is the single highest-return skill in shopping, because fiber predicts performance better than price does.

Start with the first fiber

Labels list fibers in descending order by weight. The first fiber is the garment's personality. 'Cotton 95%, elastane 5%' is a cotton garment with stretch; 'polyester 65%, cotton 35%' is a polyester garment with some cotton hand-feel. Same category on the hanger, completely different lives in the wash.

The natural fiber tiers

The synthetics, honestly

Polyester, nylon, and acrylic are not automatically bad - they add durability, stretch recovery, and lower cost. The tell is placement and percentage. Polyester in a structured blazer lining: fine. Polyester as 70% of a 'wool-look' coat: it will not breathe and will look tired fast. Acrylic in cheap knits pills aggressively; it is the fiber most responsible for the sad-sweater problem.

The 5% rule for stretch

Elastane (spandex/Lycra) above roughly 5% is a warning in anything except activewear and swim. More stretch than that in jeans or trousers means the fabric depends on elastic recovery - and elastic dies in heat. The jeans bag out at the knees within months.

Care instructions are a quality signal

'Dry clean only' on a simple cotton dress is a red flag: it often means the manufacturer did not test washing and is outsourcing the risk to you. Confidence looks like 'machine wash cold' on a garment that will clearly survive it.

Frequently asked questions

What is the first thing to read on a fabric label?

The fiber percentages, in order. They are listed by weight, largest first, and they tell you what the garment mostly is, rather than what the marketing calls it. A jumper sold as a wool knit with wool third on the label is an acrylic jumper with wool in it, and it will wear, wash, and pill like one.

Why do labels list several fibers for one fabric?

Because blends are how most cloth is made now: a base fiber for cost and body, a smaller share for stretch, strength, or hand feel. The proportions matter more than the presence. Five percent elastane changes how a garment fits and recovers. Five percent of a luxury fiber mostly changes the label.

What does the care section of the label actually commit you to?

The most restrictive safe instruction the maker will stand behind. It is written for the weakest element of the garment, which may be the dye, the trim, or a glued seam rather than the main cloth. Washing braver than the label is a gamble against that weakest element, and sometimes it pays. Just know which element you are gambling with.

Can a label tell you how long a garment will last?

Indirectly. Long staple natural fibers and dense construction cues on the label, a high wool or cotton share with nylon for strength, point one way. Short fiber blends heavy in basic synthetics point the other. The label will not promise a lifespan, but read as a buyer reads it, it is the best lifespan evidence available before purchase.