There's a pattern we've noticed in the lingerie industry. A brand launches with organic cotton, recycled fibres, or bamboo fabric. The packaging is kraft paper. The Instagram feed is full of wildflowers. And then, buried on the product page in small print: 97% organic cotton, 3% elastane.

That 3% is the problem. Not because it's a lot. But because it changes everything about what happens to that garment at the end of its life.

Why a little plastic goes a long way (in the wrong direction)

Elastane, spandex, lycra. Different trade names, same thing: a synthetic elastic fibre derived from petrochemicals. It's used in almost every bra on the market because it provides stretch and recovery that natural fibres alone struggle to replicate. Even most "eco" brands use it, because the alternatives are genuinely harder to work with.

The issue is that elastane cannot be separated from the natural fibres it's blended with. There is no industrial process that economically untangles 3% spandex from 97% cotton once they've been knitted or woven together. Which means:

This is not a technicality. It's the difference between a garment that can genuinely return to the earth and one that will persist in landfill for decades. The organic certification on the cotton label is real and meaningful. But it doesn't change the destination.

The thread nobody talks about

Even if a brand manages to source fabric that's 100% natural, there's another hidden plastic most people never think about: the thread.

The vast majority of sewing thread used in garment manufacturing is polyester. Not because manufacturers prefer it, but because it's stronger, more consistent under industrial tension, and frankly cheaper. Natural thread, particularly cotton thread strong enough for a bra's stress points, is harder to source and harder to work with at scale.

We know this firsthand. When we designed The Very Good Bra to be 100% plastic-free, we didn't just reformulate the fabric. We specified natural thread too, and we had factories decline the work. Not many. But some. Because natural thread requires adjustments to machinery settings, slows production, and carries more risk of breakage on high-speed lines.

Why brands don't fix this

We're not accusing eco lingerie brands of bad faith. Most are genuinely trying. But the commercial pressures are real. Customers expect stretch. Factories resist natural thread. Certifications like GOTS don't cover thread in the same way they cover fabric. And "97% organic" sounds, to most ears, like a very high number.

The result is an industry where "sustainable" has quietly come to mean "better than conventional" rather than "genuinely closed-loop." Which is a meaningful improvement. But it's not the same thing, and we think you deserve to know the difference.

What 100% plastic-free actually requires

At TVGB, plastic-free means the entire garment: fabric, elastic, thread, and any other component that touches your body or ends up in landfill. We use natural rubber elastic where other brands use elastane. We use 100% cellulose thread throughout, even where it's inconvenient. And yes, it took longer to get right.

The reward, for you, is a healthy bra that can actually be eaten by worms at the end of its life. Not theoretically. Not "mostly." Completely. Because there is no 3% exception sitting in the soil for the next two hundred years. We have only ever made 100% spandex-free bras.

We're not the only brand trying to get here. But we want you to be able to spot the difference, because the marketing language that surrounds "eco" lingerie makes it genuinely hard to tell. Look for the thread. Look for the elastic. Look for the full ingredient list, not just the headline fabric claim.

A spandex-free bra can be beautiful, comfortable, and 100% free of plastic. It just takes longer to make. We think that's worth it.