Regulation (EU) No 1007/2011 sets the names that must be used for textile fibres and the way composition is shown on labels and markings. It has applied since 8 May 2012. The regulation says what a product is made of. On its own, that statement is not an environmental claim, and it is not the digital product passport.
Textile products placed on the Union market need a label or marking that states the fibre composition, using the fibre names in the annexes. Only those names may be used for the fibres the annexes cover. A marketing name cannot stand in for the fibre name. Percentages follow the regulation, including how a product with several fibres is described and which small parts can be left out. The label has to be durable, legible, visible and accessible, so a buyer can read it before purchase. Selling online does not remove the duty. The composition still has to be available at the point of sale.
Member States enforce the regulation. A wrong fibre name, a missing percentage, or a composition that does not match the product can be a labelling offence even when the seller made no green claim. Depending on the role, the producer, the brand or the retailer that places the product on the market can each be responsible. Imports are covered. The official text is CELEX 32011R1007. A company printing labels should take the spelling of a fibre name from the official annexes.
A revision of textile labelling has been discussed for several years. No successor has been adopted. Until a new regulation says otherwise, fibre names and composition labels follow Regulation (EU) No 1007/2011. Check the official text for any later change. Environmental wording placed next to the fibre line is a different question, covered by the EmpCo directive. A correct cotton percentage does not make the word sustainable lawful.