What "Sustainable Sleepwear" Actually Means — and How to Buy It Honestly

"Sustainable" is doing a lot of work in fashion copy at the moment, and most of it is unearned. So rather than tell you our sleepwear will save the planet, here is what the terms on a sleepwear label actually mean — including where they stop — and what genuinely moves the needle when you are buying.

Beechwood modal: what it is, honestly

Modal is a semi-synthetic fibre. That word matters. It starts as cellulose — usually beech pulp — which is dissolved into a solution and then re-spun into filament. It is not a raw natural fibre like cotton or linen, and it is not a petroleum-derived synthetic like polyester. It sits between the two, and it inherits properties from both sides: the moisture handling of a cellulose fibre, the consistency and durability of a manufactured one. The full process is here.

The environmental case for it is real but conditional. Beech is fast-growing and can be harvested from managed forestry, and it needs dramatically less irrigation than cotton — cotton is one of the thirstiest crops in agriculture. The processing, though, uses chemicals, and whether that is a problem depends entirely on whether the mill runs a closed-loop system: one that captures and reuses the solvents and water rather than discharging them.

That is the question worth asking of any brand, including us. "It's modal, so it's sustainable" is not an argument. "It's modal from a closed-loop process" is.

Organic cotton: what it does and does not fix

Organic cotton is grown without synthetic pesticides and fertilisers, which is a genuine benefit to soil and to the people working the fields. What it does not automatically fix is water use — cotton is thirsty however it is grown — or what happens at the dyeing and finishing stage, which is where a lot of textile pollution actually originates. As a farming practice it is better, not solved.

It is also a certification, not a description. The word means something only when a third party has audited the chain and issued a certificate number, which is precisely why it gets used so loosely by everyone else. We hold no organic certification, so we do not put the word on our own fabric. We call it cotton, because that is what it is. It is the fibre we choose where a garment has to take a warm wash and a nightly cycle without ceremony — which is why it runs through our cotton sets and the whole kids' range.

The 5% elastane question

Most stretch sleepwear, ours included, contains a small percentage of elastane. It is not biodegradable, and it makes a garment harder to recycle at end of life. That is a genuine trade-off and it deserves stating plainly rather than being left off the label discussion.

The counter-argument is lifespan. Elastane is what gives a knit recovery — the ability to return to shape instead of bagging at the knees and elbows. A 100% modal set without it loses its shape faster, which means it gets replaced sooner. A garment worn for five years has a far smaller footprint than three garments worn for eighteen months each, even if the five-year one is 5% less pure on paper.

That is the honest version of the trade: a small amount of a non-renewable fibre in exchange for a much longer useful life.

The lever that actually matters

Here is the uncomfortable part for everyone selling clothes: the fibre choice is a second-order decision. The first-order decision is how long you keep the garment.

Extending the active life of a piece of clothing is, by a wide margin, the most effective thing an individual can do to reduce its footprint. Not the fibre. Not the packaging. The number of times it gets worn before it is thrown away.

Which reframes what "buying sustainably" looks like in practice:

• Buy two good sets rather than five cheap ones. Two sets in rotation last far longer than the same money spread across five, because each one gets washed less and recovers between wears.
• Buy the size that fits, not the size you want to fit. Clothing that is uncomfortable does not get worn, and unworn clothing is the worst outcome of all. Our sets run UK 6 to UK 28 — the size guide has the measurements, and the Curve & Plus-Size collection filters to the larger end.
• Wash cooler and dry gentler. A large share of a garment's lifetime energy use happens in your own machine, and heat is what breaks fibres. 30°C, low tumble, out slightly damp — in a mesh bag if it has ties or buttons.
• Skip the fabric softener. It coats fibres, dulls colour and increases pilling — it actively shortens the life of the thing you are trying to soften.

What to ask any brand, including this one

1. Where is the fibre from, and is the processing closed-loop?
2. What is the full composition — not just the headline fibre?
3. How long is this actually built to last, and what happens if it fails?
4. Can I get it repaired, or is replacement the only option?

Any brand that answers those four clearly is doing better than one with a green leaf icon and a paragraph about the planet. Ours are answered on the sustainability page and in where our materials come from.

Where we stand

We make sleepwear in beech-derived modal, cotton and mulberry silk, in sets designed to be worn for years rather than seasons — and we would rather you bought two sets and kept them than six and replaced them. That is the whole philosophy, and it is deliberately unglamorous.

You can read more about our materials on the fabrics page, or browse the pure cotton sets.