Purchasing practices are the way that a company interacts and does business with the manufacturers that supply their products. It encompasses strategic planning, sourcing, development, purchasing (buying) and the underlying behaviours, values and principles which impact workers. Disclosure of payment terms is important because it helps suppliers plan and as they front the costs of production (in most cases) having this information better enables rompt and fair terms of payment helps suppliers with cash flow enabling them to pay workers on time and adequately.
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.