There's this guy Gary and his wife down in Texas that grow cotton completely organically. They're certified organic by the Texas Dept. of Agriculture and so are the other growers they now buy cotton from.
They also gin the cotton, spin the yarn, knit the cloth and sew the shirts. Washing is done with natural biodegradable soaps and softeners. No formaldehyde is used.
I don't mean they do it all in their kitchen. They've created a textile industry around these T-shirts. It's quite an accomplishment to make a T-shirt from seed, sun and water, don't you think?
Anyhow, the t-shirts are nice, 5.5 oz. jersey, standard size to start, sewn with cotton thread, double needle hems and neckline. Natural color, takes dyes very well.