GOTS vs OEKO-TEX vs Allergy UK vs Hypoallergenic: What Lingerie Labels Actually Guarantee

Three of these four labels guarantee something you can check. GOTS certifies organic fibre content and the chemistry used to process it. OEKO-TEX STANDARD 100 tests the finished textile, trims included, for harmful substances. An Allergy UK endorsement means independent laboratory assessment. "Hypoallergenic" has no legal definition and guarantees nothing at all.

That last one surprises people, so it is worth saying plainly: a brand can print "hypoallergenic" on a bra label with no testing, no standard and no consequence. Meanwhile the things most likely to make your skin itch, the dyes, the elastic and the metal in the hooks, are not required to appear on a UK clothing label at all. Here is what each label covers, what it leaves out, and how to read one when your skin is at stake.

What does each lingerie label actually guarantee?

Each answers a different question. GOTS asks "what is this fibre and how was it processed?" OEKO-TEX asks "what is left in the finished fabric?" Allergy UK asks "has an independent lab assessed this for allergy sufferers?" And "hypoallergenic" asks nothing, because nobody is checking.

Label	What it certifies	Covers dyes and finishes?	Covers metal and elastic trims?	Independently audited?	Legally defined?
GOTS	Organic fibre content plus the whole processing chain. 95% organic fibre for the "organic" grade, 70% to 94% for "made with organic materials"	Yes. Dyes and processing chemicals must be assessed and approved before use	Partly. Accessories fall under GOTS criteria, but the label is about fibre and chemistry, not allergy	Yes, annual on-site audits of every company in the chain	No, but it is a formal published standard
OEKO-TEX STANDARD 100	The finished article tested against a list of over 1,000 harmful substances	Yes, including banned azo colourants and other regulated substances	Yes. Testing covers every thread, button and accessory	Yes, certificates run for one year and must be renewed	No, but it is a formal published standard
Allergy UK	Product assessed by an independent laboratory against allergy-specific criteria	Assessed as part of the product, not as a chemical audit	Assessed as part of the product	Yes, testing is carried out by an independent lab, not the brand	No, but it is a charity-backed endorsement scheme
"Hypoallergenic"	Nothing. It is a marketing word	No	No	No	No. There is no legal definition

Checked August 2026 against each scheme's own published information. Standards are revised periodically, so confirm current criteria before relying on them.

What does GOTS certification guarantee?

GOTS, the Global Organic Textile Standard, is the strictest of the four on what goes into the fabric. The top "organic" grade needs at least 95% certified organic fibre. Between 70% and 94% a product can only be labelled "made with x% organic materials", so up to 30% may be conventional or synthetic. Below 70%, no GOTS label is allowed at all.

What makes GOTS useful for sensitive skin is that it does not stop at the farm. Every company in the chain, from spinner to dyehouse to maker, has to be certified separately with annual on-site audits, and dyes and processing chemicals must be assessed and approved before anyone is allowed to use them. That is the part that matters if your reaction is to processing residue rather than to cotton itself.

The honest limitation: GOTS is an organic and environmental standard, not an allergy standard. A GOTS-certified fabric can still be made up into a bra with a nickel hook and a rubber elastic, because those are trims rather than the certified textile.

What does OEKO-TEX STANDARD 100 test for, and what does it miss?

OEKO-TEX STANDARD 100 comes at the problem from the opposite end. Rather than tracking how the fabric was made, it tests the finished article against a list of over 1,000 harmful substances, including banned azo colourants, PFAS, cadmium and lead, in line with REACH and the ECHA candidate list. Crucially for lingerie, testing covers every thread, button and accessory, so hooks and elastics are in scope in a way they are not under a fibre-based standard.

There are four product classes. Class I is strictest and applies to babies and small children under three; Class II covers materials with direct skin contact, which is where bras and knickers sit; Class III and IV cover items without skin contact and home textiles. So an OEKO-TEX label on a bra should be Class II, and the class is printed on the certificate, which lasts one year before renewal.

Here is what most shoppers get wrong: STANDARD 100 says nothing about whether a fibre is organic, and a fully synthetic polyester bra can carry it. OEKO-TEX runs a separate ORGANIC COTTON label for that. If a brand says its bras are "OEKO-TEX certified organic cotton", check which certificate it holds.

What does an Allergy UK endorsement mean?

Allergy UK's Seal of Approval has run since 1995 and is the only one of these four built specifically for people with allergies. Products are tested by an independent laboratory, Allergy Research Limited, using protocols based on recognised industry test methods and extended with allergen-specific criteria. The brand does not mark its own homework, and applications take a minimum of twelve weeks.

Worth knowing: the scheme has more than one route. The Seal of Approval is for products independently proven effective at reducing or removing allergens, while the Allergy Friendly Product Award covers products judged unlikely to cause a reaction, which is a different bar. Neither is a legal certification, and neither guarantees that you personally will not react. What it does mean is that somebody independent looked, which puts it well ahead of a word on a swing tag.

JulieMay's lingerie carries Allergy UK certification alongside GOTS-certified organic Pima cotton and 100% Mulberry Peace Silk linings. The combination is deliberate: the fibre standard covers what the fabric is made of, the allergy endorsement covers whether the finished thing suits reactive skin.

Does "hypoallergenic" mean anything on a lingerie label?

No, and the regulators say so themselves. The US Food and Drug Administration puts it bluntly: "There are no Federal standards or definitions that govern the use of the term 'hypoallergenic'", and "the term means whatever a particular company wants it to mean." That is written about cosmetics, where the claim was at least common enough to attract a ruling. For textiles there is not even that.

In the UK, the Textile Products (Labelling and Fibre Composition) Regulations 2012 require a clothing label to state fibre composition and very little else. Nothing about dyes or finishes. Small components such as buttons, buckles and fasteners are excluded from the composition calculation altogether, along with decorative matter of 7% or less. So a bra can be labelled "95% cotton, 5% elastane", be entirely accurate, and tell you nothing about the metal in the hook, the rubber in the band or the dye in the lace.

None of this makes "hypoallergenic" a lie. Plenty of brands using it make genuinely gentle products. It just means the word carries no information, so it cannot be the thing you rely on. If a bra described as gentle still left you with a red line, our guide to a rash on the bra strap line walks through the usual suspects.

Which irritants hide in lingerie that no label has to declare?

Disperse dyes. These are the dye class used on synthetics such as polyester, nylon and acetate, because water-soluble dyes will not fix to those fibres. They sit loosely in the fabric and can rub off onto skin, especially where a garment is tight and warm. DermNet lists them among the main causes of textile contact dermatitis, and Disperse Blue 106 and 124 are established enough as culprits to serve as screening allergens. Practical upshot: dark, saturated synthetics carry the most dye, pale natural fibres the least.

Formaldehyde finishes. Easy-care, non-iron and crease-resistant fabrics get there via formaldehyde-based resins cross-linked into the fibre, a recognised cause of allergic contact dermatitis from textile resins. DermNet advises sensitive skin to avoid anything sold as "non-iron" or "dirt-repellent". None of this appears on the label.

Latex and rubber accelerators. The elastic in a bra band is where this bites. Natural rubber latex is one issue; so are the chemicals used to vulcanise it, the thiurams, carbamates and mercaptobenzothiazole known collectively as rubber accelerators. They are a common trigger where elastic meets skin, which is why the itch so often traces the underband rather than the whole garment.

Nickel. Hooks, eyes, sliders and wire tips. UK and EU chemicals law caps nickel release from articles in prolonged skin contact at 0.5 micrograms per square centimetre per week, but read that carefully: it limits how fast nickel comes out, not whether nickel is there. For someone already sensitised, a compliant fastening can still be too much. Our explainer on contact dermatitis from clothing covers how to tell these apart from a fit problem, and the NHS notes that once you identify and avoid the substance responsible, the skin usually settles by itself.

How is cotton-wrapped elastic made, and why does it matter?

Ordinary stretch fabric uses a bare elastane or rubber filament, or a core-spun yarn where the elastic core is only thinly covered, so some of the stretch fibre ends up at the surface touching you. Covered elastic yarn works differently: the core is wound with a continuous sheath of another fibre, cotton in JulieMay's case, so it is enclosed along its whole length. Single covered yarn has one wrap; double covered adds a second in the opposite direction, which sits more evenly and resists the sheath twisting open under repeated stretch.

The result is a band that stretches and recovers normally, but where the layer against your skin is cotton rather than rubber or elastane. That is why a garment can contain elastic and still suit a latex-sensitive wearer, and why "contains elastane" on a composition label tells you nothing on its own. The question is not whether stretch fibre is present. It is whether it touches you.

The same logic runs through the rest of the construction: nickel-free fastenings, non-metallic bendable wires in styles like the Morpho bendable-wire bra (£80) instead of steel, and tagless finishing so no printed label saws at your back. If seams and bands are your particular problem, we cover that in our piece on why some women cannot tolerate seams, tight bands or scratchy fabrics.

Which label should you actually look for?

It depends on what your skin reacts to, and no single label covers everything. If your concern is chemical residue and processing, look for GOTS and check the grade: "organic" means 95% or more, "made with organic materials" can mean as little as 70%. If your concern is the finished article including trims, look for OEKO-TEX STANDARD 100 at Class II. If you have a diagnosed contact allergy, an Allergy UK endorsement is the one designed for you, ideally alongside a fibre standard. If all you can see is "hypoallergenic", treat it as decoration.

The more useful habit is to stop reading labels for reassurance and read them for specifics. Ask what touches the skin, what the fastenings are made of, and whether the elastic is exposed. A brand that answers those three in writing is telling you more than any badge. JulieMay's range runs on that principle, from the Rosie wireless lace bra (£80) and the smooth Ditsy Floral t-shirt bra (£80) to the everyday Hope brief (£34), with bras from £65 to £81 and briefs £34 to £38.

Frequently asked questions

Is GOTS better than OEKO-TEX?

They measure different things. GOTS certifies organic fibre content and the processing chain behind it, with annual audits at every stage. OEKO-TEX STANDARD 100 tests the finished product, trims included, for harmful substances. The strongest position is a product holding both, or a fibre standard plus an allergy-specific endorsement.

Does OEKO-TEX certified mean organic cotton?

No. STANDARD 100 is a harmful-substances test and applies equally to fully synthetic fabrics. OEKO-TEX has a separate ORGANIC COTTON label verifying organic fibre content, including GMO testing. If organic matters to you, check which certificate the brand holds.

Can lingerie be labelled hypoallergenic without any testing?

Yes. There is no legal definition, no required testing and no body checking the claim. The FDA states there are no federal standards governing its use and that it means whatever a company wants it to mean. UK textile labelling law does not regulate it either.

What is the difference between GOTS "organic" and "made with organic materials"?

Fibre percentage. The "organic" grade requires at least 95% certified organic fibre. "Made with x% organic materials" covers 70% to 94%, so up to 30% can be conventional or synthetic. Below 70%, no GOTS label is permitted.

Are nickel-free bras a legal category?

No. UK and EU rules restrict nickel release to 0.5 micrograms per square centimetre per week for items in prolonged skin contact, but that is a release limit rather than a ban, and compliant components can still contain nickel. Nickel-free is a voluntary claim, so it is worth asking what the fastenings are actually made of.

Why does my bra irritate me even though it says 100% cotton?

Because the composition label describes only the main fabric. Fastenings, elastics and decorative trims can be excluded from the calculation, and dyes and finishes never appear at all. A cotton bra can still have a nickel hook, a rubber-based elastic and a resin finish, any of which may be the real trigger.

Should I wash new lingerie before wearing it?

Yes, always. Washing removes some surface dye and residual processing chemicals before they sit against warm skin all day. Use a fragrance-free detergent, skip fabric softener, and add a rinse cycle if your skin is flaring.

Does certification guarantee I will not react?

No, and any brand promising that is overselling. Contact allergy is individual. Certification narrows the odds by removing common triggers and putting an independent check behind the claim. If irritation persists despite gentle, certified lingerie, ask a GP about patch testing to identify the specific allergen.

The bottom line

Labels are useful, but only when you know what each is measuring. GOTS tells you about fibre and chemistry. OEKO-TEX tells you what is left in the finished article, trims included. Allergy UK tells you an independent lab has assessed it for allergy sufferers. "Hypoallergenic" tells you a marketing team liked the sound of it. The irritants behind most bra-related reactions, dyes, elastics, finishes and metal fastenings, sit largely outside what a UK label must disclose, which is why the brands worth trusting are the ones that volunteer the detail. To see how that plays out across the market, our guide to the best bras for sensitive skin in the UK for 2026 compares eight brands side by side, and our look at the science behind organic cotton explains why the fibre underneath all this certification matters in the first place.