Why Polyester Can Lower a Garment’s Cost
For a fast-fashion label, fabric is one of the costs repeated across every item in a large run. Polyester, a synthetic fiber made from polymers, can be less expensive than cotton, depending on prices and the fabric being bought. Replacing some or all of the cotton with polyester can therefore reduce the cost of making a shirt or dress—and help keep its retail price low.
That saving is not simply a matter of choosing one fiber over another. The weave, weight, finishing and blend all affect a fabric’s price and performance. But when a cheaper synthetic meets the design brief, it gives manufacturers a way to produce large quantities without paying for as much cotton.
The Tradeoff Shows Up on the Body
Cotton readily absorbs moisture. Polyester absorbs less, so sweat can remain on the skin or inside the fabric rather than soaking into the fiber. How uncomfortable that feels depends on the garment’s cut and construction, but a polyester item may feel warmer or less breathable, especially in heat.
Fire behavior also depends on the garment, not just its label. Both cotton and polyester can burn. Polyester can soften and melt when heated, potentially sticking to skin and worsening a burn; that is a different hazard from cotton’s tendency to ignite and continue burning. “Synthetic” does not mean fire-safe, and “cotton” does not mean fireproof.
Where the Savings Go
The lower material cost benefits the producer first; shoppers may see it in a lower price, though the final price also reflects labor, transport, branding and retail markup. The tradeoff is that the bargain can come with less comfort in some conditions and a different risk around heat or flame. A small change in fiber content can thus save money across a production run while changing how the garment feels—and how it behaves when exposed to fire.
