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American Apparel?
https://www.americanapparel.net/aboutus/ -
Noticed H&M have a 'Concious' line when I was last in there:
http://www2.hm.com/en_gb/men/shop-by-concept/conscious.html?product-type=men_conscious&sort=stock&offset=0&page-size=60
http://sustainability.hm.com/en/sustainability/about/hm-conscious/about-hm-conscious.html -
Rapanui? Not bought, only heard of them.
https://rapanuiclothing.com/category/mens-plain-t-shirts-and-hoodies/
Can anyone recommend a place to buy good quality ethical plain t shirts?