Have had experience with there Earth Positive tshirt range and they have performed well with DTG printing. The have a great ethical policy and are great value. They are Carbon reduced, Organic, sustainable etc (https://www.continentalclothing.com/home/about)
We also use Continental Earth Positive range and have found the quality really good, we get lots of comments from customers about how soft and durable the t-shirts are. They take eco-friendly inks well, too, particularly the darker colours.
Yes, we also use Earth Positive, and I'm really pleased with both their ethics and the quality. We're still wearing t-shirts we produced 3 years ago, so that's a good endorsement too. I'm just starting to use Stanley and Stella too, who are ethical. I've been testing lots, and loads of their products are great, but one or two not the consistent quality of earth positive, so I have to be selective.
I also use Continental Clothing. I did a lot of research before I started printing and the quality of their tshirts is second to none. They are great to deal with and have a great ethical standard. My kids wear my tshirts and they keep their shape well wash after wash!