FOB are up-front costs assumed by suppliers, holding them liable for transportation of goods, in the case they are damaged or destroyed—this is in addition to the raw material costs suppliers pay in advance. Brands' purchasing practices influence suppliers' ability to keep the lights on in their facilities and pay workers on time, so any changes in prices could impact this.
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.