I’m not that familiar with Shanghai to be honest (I’m from Beijing), but I’ve read a lot of good things about Fumin Road. I’d definately check that out.
also, http://www.shanghaistylefile.com/shanghai-shopping-guide/ has a good shopping guide for Shanghai.
There’s a lot of individual artists/designers who have Taobao accounts that you might like to check out, they’ll ship to anywhere in/from China. maybe some of my followers can give you their input as well?