Where can I get eco-friendly dresses?

I’m looking for the apparel that are latest in eco-fashion.
Meaning, I like to get the tanks/tops/shirts that have any prints or messages written on it like Organic Earth, or Mother Earth etc. It looks so cute and different than any other shirts.

Can anybody like to share your ideas on eco- fashion?
Which place do you think is the best for buying eco-friendly dresses?