As far as I know, there is still no Fair Trade clothing certification for anything sold in the US. Only European. Oh, and it is usually only the manufacturing of the clothing that is certified, not the cotton growing... So not an easy process to find "good" companies... HaeNow
Organic Tees: Certified Organic Cotton Fair Trade T Shirts - Hae Now and eConscious are two companies I use. Look under the Green Pages of Co-op America for other companies, although I recently had a retailer tell me they won't buy from me, because eConscious is on the Green Pages but isn't Fair Trade certified... Whatever. I try to do the best I can! Good luck.
Michelle