On my Christmas visit to my brother in Oakland, California I passed a store in his neighborhood called “Cotton Basics.” True to it’s name they sell simple cotton tops, skirts, and dresses, that are all made right there in Oakland.
You can buy their clothes online. http://www.shopcottonbasics.com/
I picked up two shirts there and I really like them. They are nicely cut, pretty affordable, and come in nice colors. I am wearing one today, it looks like this: