There are dozens of them, so how do you place yourself between all these labels? The public and private labels, and also the certified and non-certified labels? I have listed the main labels and their field(s) of action to help you see more clearly.
The fibers used in the world of textiles are diverse but their transformation(s) and their impact(s) are all equally varied.
I propose you this article by detailing you three families of materials (synthetic, artificial, vegetable) as well as their derivatives. Moreover, I point out those to be preferred, avoided or to be watched.
We can conclude that the choice of a vegetable fiber (except for non-organic cotton) would be the best choice for you and moreover for the planet.