A supplier can describe a product as sustainable using very different information. The statement acquires meaning when it is possible to understand what has been measured and what part of the offer concerns. A general formula leaves many questions open.
I propose to ask for perimeter, method and relevant documentation. A result on the material does not coincide with a complete evaluation of the product; an improvement referring to one line does not necessarily describe all the others. The period can also change the meaning of the comparison.
A hypothetical example is a stated reduction from an earlier version. It is necessary to know whether the function, quantity and conditions are comparable. Without this information, the percentage can be difficult to interpret, even when the document looks professional.
The European Textile Strategy considers the whole life cycle: this perspective helps to ask questions about aspects left out of a single statement. The obligations applicable to the communication require a specific verification. As far as purchasing is concerned, I propose that documentation be retained and that only what it supports be used in its descriptions. Accuracy allows a more useful comparison between offers and reduces promises without sufficient feedback.