For a while now I've been lamenting the fact that I couldn't find a US-based shopping site that sourced a wide range of ethical clothing that I would actually wear. Somehow I managed to miss ASOS's Green Room, which does just that (although ASOS is based in the UK, it has a US site allows users to browse without worrying about currency conversion). Launched in 2010, the Green Room is a section of ASOS's larger site that carries organic and fair trade brands like People Tree as well as a number of Made in the UK and Made in the USA brands like The Cambridge Satchel Company and Gloverall. Although they can be pricey, all of the items in the Green Room fall into one or more ethical categories, which the section conveniently describes in an interactive glossary.
Definitely worth checking out as you make your way through your holiday shopping list.