I just wandered around a shopping mall in Melton, and looked the labels of lots of expensive t-shirts. Almost all of the them were 100% cotton, made in China.
In Best and Less they had plain t-shirts for $5. Made in Bangladesh using 100% organic cotton. In Target they are $8
Presumably they don’t cost much different to source. So unless quality is an issue, would not organic cotton be the proper choice?