Sustainability is not a protected term in describing materials. This means brands can use the term 'sustainable' about their materials without following a specific standard. Therefore it is useful for brands to disclose what they mean when they say 'sustainable cotton' or 'sustainable viscose'
A note on the scoring system

WikiRate has a standardised 10-point scoring system making it possible to compare company scores across different benchmarks. On WikiRate.org, the Fashion Transparency Index scoring system, where each company can get a maximum of 250 points, has been converted to the 10-point scoring system - with 10 being the highest a company can score and 0 being the lowest. These company scores can also be translated to percentages e.g. if a company has scored 2.5 out of 10 on WikiRate, they have achieved 25% of the 250 points in the Fashion Transparency Index.