A practical check of an unfamiliar label takes under an hour and uses only public sources. Start with the legal layer: the business register of the claimed country of operation, and trademark databases such as the EUIPO's eSearch or the USPTO's system, which show whether a name is registered, to whom, and for which goods.
Then examine the digital layer. The Wayback Machine reveals a domain's age and past content; a WHOIS lookup shows registration dates. On the product layer, look for fibre composition, country of origin, and care information — legally required in the EU and the US — and reverse-image-search photos to see whether imagery is original or reused from suppliers.
No single signal settles legitimacy. A young brand may legitimately lack a trademark or a long archive. The pattern matters: consistent answers across registers, labels, and history indicate a real operation; contradictions across them indicate caution.