Good On You
Ranks brands on their sustainability, ethics and environmental footprint
With the app goodonyou (you can just use their website too) you can check how sustainable a brand is (or not). They will tell you with one search how the brand of the shirt you are wearing performs in regards to their workers, animals and the planets. And if it turns out that you are wearing a sweater that was most likely produced by a 7-year old in a dark basement, it gives you some brands that produce similar clothing - but ethically.