A number of people have asked “how do I make sure my clothes are ethically sourced?”
treehugger has been publishing a number of articles on sustainable and fair trade clothing and this one kind of summarizes what to look for;
Here’s the link to their sustainable fashion section, with articles on “slow fashion”, eco-friendly jewelry, recycling clothing, choosing fair trade and locally made items, and lots of other related topics.
ETA; check out comments for other suggestions - fortheloveofbeets has a number of good points.
Also; upcycling (consignment and thrift stores), and re-purposing; using the fabric from clothes to make other clothes. This is the time honored way of making crazy quilts.