Upvote:4
I would recommend you to go to one of the malls in the area. The malls in the 3rd tier cities have more and more factory outlets inside where you can buy quite cheap branded (genuine) goods.
Personally I have never seen used clothes shops in China either. What you can try alternatively are "wet markets" or street markets. There is no guarantee of course if those products are genuine or not., most likely they are fake.
I am afraid that in the poorer areas people simply cannot afford brands that you can recognize and therefore there are also no used clothing shops. People nowadays rather sells such clothes online since the market is so much easier to manage than running a retail outlet with it. Retail space is very expensive in China because of the real estate boom.
Also I heard that there is a certain hesitance in China to wear clothes that used to belong to someone unknown.