It's hard to know in general and the recent expose definitely highlighted that a lot of the bigger grocery chains are also using forced labor conditions. ie Marks, Tesco etc.
Brands when they are getting their clothing manufactured are more likely to care about the supply chain and the workers conditions. Bare in mind that a seemingly good factory in China might still be offering 1 days holiday in the calendar year. However, at least it's not forced.
The whole industry stinks though. I mean consumers just want bottom dollar so the whole thing drives abhorrent practices. :/