"While very imperfect and subject to criticism, our affiliation with Better Cotton has provided some assurance that the risks of Modern Slavery are being assessed at this level. In 2020 Better Cotton suspended its activities in the Xinjiang region of China due to concerns about forced labour in the region." (p. 15) [may not meet the question threshold - implicit response through 65% Better Cotton sourcing]
Affiliation with The Global Organic Textile Standard is noted; "The social criteria are based on the key norms of the International Labour Organisation (ILO) which must be met by all processors and manufacturers." (p. 16)