The Complete Guide to Silk for Sensitive Skin

Silk suits sensitive skin because it is a smooth protein filament with very little surface friction, it absorbs moisture instead of trapping it against you, and once it has been degummed it carries almost nothing that commonly irritates skin. It is not a treatment for eczema, and the best UK trial found no clinical benefit, but as a next-to-skin fabric it is one of the kindest you can wear.

That second half matters, and most silk guides skip it. We have made silk and organic cotton lingerie for women with reactive skin for years, and we would rather tell you where silk earns its place than sell you a miracle. So: what silk is, how Mulberry and Peace Silk differ, what momme means, what the research shows, and how to wash it without ruining it.

What actually makes silk different from other fabrics?

Silk is a continuous protein filament. A silkworm spins one unbroken thread that can run well over a kilometre, so silk fabric has far fewer fibre ends poking out of it than a spun fibre like cotton or wool. Fewer fibre ends means less scratch, and scratch is a real trigger for skin that flares when something rubs.

The raw filament has two parts. Fibroin is the structural core, the bit you want. Sericin is the sticky gum holding the cocoon together, and it is the part most associated with reactions. Degumming removes it, so what sits against your skin in any decent lingerie silk is essentially fibroin.

Silk also handles moisture well, absorbing water vapour into the fibre rather than leaving it on the surface. Standard moisture regain puts cotton at 8.5% and polyester at just 0.4% (NPTEL textile engineering reference). Silk, a protein fibre, sits in the absorbent camp. That is the difference between a band that feels clammy by mid-afternoon and one that does not.

The NHS lists heat and changes in temperature among the things that make atopic eczema worse, and advises keeping cool. That is the mechanism silk is good at, rather than anything medicinal.

Is all silk the same? Mulberry, Peace Silk, tussah and momme explained

No, and the labels are confusing. Here is the plain version.

Mulberry silk comes from Bombyx mori, the domesticated silkworm fed on mulberry leaves. Reared on one diet in controlled conditions, it spins a filament that is long, fine, even and pale. It is the benchmark for quality.

Tussah or wild silk comes from moths feeding on oak and other leaves. Its filament is shorter, coarser and naturally tan: lovely for outerwear, rougher next to skin.

Peace Silk, also called Ahimsa silk, is a method rather than a species. The moth is allowed to emerge before the silk is harvested, instead of the cocoon being heated with the pupa inside. The trade-off is yield: once the moth breaks through, a cocoon gives roughly a sixth of the harvestable thread, which is why Peace Silk costs more. The term is not legally defined, and some producers have been criticised for how the moths are handled afterwards, so the claim is only as good as the supplier behind it.

Momme (written mm) is silk's weight unit, not a quality grade: one momme is the weight in pounds of a piece of silk 45 inches wide and 100 yards long. Lingerie silk typically sits in the low to mid teens, bedding is heavier. Higher momme means denser and more durable, not softer, and a very heavy silk in a bra lining would be stiff rather than lovely.

Our own linings are 100% Mulberry Peace Silk over GOTS-certified organic Pima cotton. We unpicked what GOTS, OEKO-TEX and Allergy UK labels guarantee separately.

What does the evidence actually say about silk and eczema?

Here we have to be honest, because the headline finding does not flatter silk. The CLOTHES trial, published in PLOS Medicine in 2017, randomised 300 children aged 1 to 15 with moderate to severe eczema to sericin-free silk therapeutic garments plus standard care, or standard care alone, for six months. Eczema severity measured by EASI came out at a geometric mean of 5.4 in both groups, an adjusted ratio of 0.95 (95% CI 0.85 to 1.07, p=0.43). Skin infections were 25% with silk and 28% without. The authors concluded that silk clothing is unlikely to provide additional benefit over standard care.

The NIHR summary put the cost at £56,811 per quality-adjusted life year, far above the usual NHS threshold, and questioned whether the NHS should fund the garments at all.

So what does that mean for a silk-lined bra? Nobody should sell you silk as a treatment, and we do not. But the trial measured medical outcomes in children with moderate to severe disease, which is a different question from whether a silk lining is more comfortable than a polyester one. Worth noting too: 70% of families were happy to keep wearing the garments. Comfort and measurable disease severity are not the same thing, and you are allowed to care about the first.

The National Eczema Society factsheet on clothing lands somewhere sensible. It calls silk "a good regulator of body temperature that is also soft and breathable", while still naming cotton as "the most commonly recommended material for people with eczema", and warns that ordinary silk clothes "are less practical than cotton or bamboo: silk cannot be washed as easily and creams are more likely to mark it". That last point is the honest catch, and we come back to it below.

Silk or satin: what is the difference and does it matter?

It matters enormously, and the confusion costs people money. Silk is a fibre. Satin is a weave. You can weave silk into satin, or polyester into satin, and the second is what most "satin" lingerie is.

Polyester satin looks glossy and feels slippery, so it passes the shop-floor test. What it does not do is absorb moisture. At 0.4% regain, sweat stays on the skin rather than moving into the fabric, which is exactly the overheating problem the NHS warns about. The National Eczema Society notes that many people with eczema find polyester and nylon cause overheating, sweating and irritation.

If a label says "satin" and not silk, assume synthetic. If it says "silk touch", "silky" or "silk feel", it is not silk.

How does silk compare with cotton, bamboo viscose and polyester satin?

Fibre	What it is	Moisture handling	Friction against skin	Main drawback	Best used as
Mulberry silk	Continuous protein filament, degummed to remove sericin	Absorbent, regulates temperature well	Very low, few fibre ends	Expensive, needs careful washing, marks with emollients	Linings, gussets, cups, sleepwear
Organic cotton	Spun natural cellulose; GOTS restricts dyes and finishes	Highly absorbent at 8.5% regain, slow to dry	Low, though spun fibre ends feel fuzzier	Holds damp when saturated	Body fabric, bands, everyday knickers
Bamboo viscose	Regenerated cellulose, chemically processed from pulp	Absorbent and soft	Low	Heavy chemical processing; the label tells you little	Soft everyday basics
Polyester satin	Synthetic fibre in a satin weave, sold as "satin"	Poor, 0.4% regain, moisture sits on skin	Low when new, can pill	Traps heat and sweat, a common trigger	Outer decorative panels at most

Regain figures from standard textile engineering references. Fabric behaviour varies with weave, weight and finishing, so treat this as a guide.

We go deeper on the cellulose side in our comparison of organic cotton, bamboo and synthetics, including why the bamboo label means less than brands imply.

Can you be allergic to silk?

Yes, though it is uncommon and the detail is reassuring. Dermatology references identify sericin as the main allergen, responsible for both inhaled type I reactions and type IV contact sensitisation. Most documented cases involve occupational exposure in silk processing, where airborne silk protein is the problem, not someone wearing a camisole.

Because degumming removes sericin, sericin-free silk is described as suitable for people with atopic skin. If you have ever reacted to something sold as silk, it is worth asking whether the silk was the culprit at all. Disperse dyes, formaldehyde-based easy-care finishes, latex in elastics and nickel in hooks and sliders are all far more common causes, and we unpack them in our deep dive into what makes lingerie allergy-friendly.

Where should silk sit in a bra or a pair of knickers?

Against the skin, and nowhere else particularly.

A bra made entirely of silk would be a poor bra. Silk has limited recovery, so it should not be the band holding you up. You want silk where skin contact happens: cup lining, gusset, anywhere that sits in a fold, with a stable, breathable fibre doing the structural work behind it.

Our Hope bralette is built that way: cups and gusset lined in 100% pure silk, body woven from 78% organic Pima cotton with 22% silk, wire-free, UK sizes 8 to 18, £73. For anyone needing real cup support, the Rosie full cup wireless bra runs 30B to 42DD at £88, a wider range than most people expect from a sensitive-skin brand.

Construction matters as much as fibre: nickel-free fastenings, non-metallic bendable wires where there are wires at all, cotton-wrapped elastics so no bare synthetic touches you, no latex next to skin, tagless finishing. That whole package is what carries our Allergy UK certification, not the silk on its own. A silk lining undone by a nickel hook is a waste of good silk.

If you want silk at its most literal, the 100% pure silk camisole at £98 is a single-fibre layer with nothing else in the mix, useful if you are trying to work out what your skin tolerates. For sleep, the silk-lined nightdress with a built-in bra at £109 is the one women come back for during hot flushes, often enough that we wrote about why menopause changes skin sensitivity.

How do you wash silk lingerie without ruining it?

This is the real cost of choosing silk, and the National Eczema Society is right to flag it. Silk is a protein, so it behaves rather like hair. Heat, alkaline detergent and vigorous agitation all damage it.

• Cool water, always. Hand wash cold, or use a mesh delicates bag on a cool, gentle cycle. Hot water dulls and shrinks the fibre.
• A pH-neutral or silk-specific detergent. Biological powders contain protease enzymes that digest protein, which is what silk is. Avoid them.
• No bleach, no fabric conditioner. Bleach destroys the fibre; conditioner coats it and kills the handle.
• Press, do not wring. Roll in a towel, then dry flat or on a hanger away from direct heat and sunlight.
• Never tumble dry. No exceptions worth making.
• Rinse thoroughly. Detergent residue is itself a common irritant, and the NHS lists washing detergent among the things to avoid with eczema.

One note for emollient users: greasy creams do mark silk, exactly as the National Eczema Society says. Give the cream a few minutes to absorb before dressing, and accept that a silk lining worn over heavy ointment needs washing more often than a cotton one.

Is silk actually worth the money?

It depends what you want from it. If you are hoping silk will reduce measurable eczema severity, the evidence says no, and your money is better spent on emollients, on getting your treatment plan reviewed and on avoiding detergent residue. If you are buying comfort, a lining that does not scratch and a band that does not sit damp, then yes, and most women who switch do not go back.

Silk-lined bras in our range run £73 to £89 and knickers £38 to £43, several times the cost of a high street cotton-rich set. That is a real gap. You are paying for a low-yield natural filament, certified organic cotton behind it, and construction choices that cost more at every step. Whether that maths works is yours to do, not ours.

Worth saying plainly: cotton is a perfectly good answer for a lot of people, and the National Eczema Society recommends it more often than silk. If budget is tight, well-chosen organic cotton with sensible fastenings beats cheap "silky" polyester at any price. Our pick across the wider UK market is in the guide to the best bras for sensitive skin, and we have not only listed our own.

Frequently asked questions

Is silk hypoallergenic?

"Hypoallergenic" has no legal definition in UK textiles, so the word alone guarantees nothing. What is true is that degumming removes sericin, silk's main known allergen, and that silk is less likely than wool or synthetics to cause the friction and overheating that trigger flares. Treat it as low-risk, not allergy-proof.

Does silk help eczema?

Not as a treatment. The CLOTHES trial found no clinically important difference in eczema severity between children given specialist silk garments and those given standard care alone. Silk can make getting dressed more comfortable, which is a fair thing to want, but it does not replace emollients or anything your GP or dermatologist has prescribed.

What is the difference between Mulberry silk and Peace Silk?

Mulberry describes the species and diet: domesticated Bombyx mori fed on mulberry leaves, giving a long, fine, even filament. Peace Silk describes the harvesting method: the moth emerges before the cocoon is processed. A silk can be both, as ours is. Peace Silk yields far less thread per cocoon, which is why it costs more.

What momme weight should lingerie silk be?

Lighter than bedding. Lingerie linings generally sit in the low to mid teens: heavy enough to be opaque and durable, light enough to stay soft. Higher momme means denser, not better, and a heavy silk in a bra cup would feel stiff.

Can I machine wash silk lingerie?

Yes, carefully. Use a mesh delicates bag on a cool, gentle cycle with a pH-neutral or silk detergent, skip the fabric conditioner, and never tumble dry. Biological detergents contain enzymes that break down protein, and silk is protein, so they will shorten its life considerably.

Will silk make me too hot?

Usually the opposite. Silk absorbs moisture into the fibre and regulates temperature in both directions, which is why it suits hot flushes and night sweats as well as cold mornings. The fabrics that cause overheating are polyester and nylon, which the National Eczema Society names specifically.

The bottom line

Silk is not medicine, and the best UK trial we have says so plainly. What it is, is a smooth, moisture-absorbing, temperature-regulating protein fibre that sits more kindly against reactive skin than almost anything else, provided the sericin is gone and the rest of the garment is built with the same care. Put it where your skin touches, keep certified organic cotton behind it, check the fastenings, and wash it cool.

If you are still working out what your skin reacts to, rule out dyes, finishes, latex and nickel before you blame a fibre, and if the skin itself is not settling, keep your GP or dermatologist in the loop. Our notes on skin-friendly lingerie for dry skin in autumn cover what changes when the heating goes on.

Declared interest: JulieMay makes silk and organic cotton lingerie, so we are not a neutral party. Prices and compositions checked against our own UK site in October 2026. General information, not medical advice.