(INFJ) We bought a lot of our children's clothes at thrift stores. But that had more to do with our budget than my type.
They got to dress much better than they would have if we had bought their clothes at a regular store, because we got a lot of name brands there that we otherwise couldn't afford. The secret is to find a thrift store that gets donations from an upscale area. We also get a lot of T-shirts there - you can get just about any kind of T-shirt at a thrift store. Since you can't try on clothes at our favorite thrift store, we stick mostly to shirts & tops that don't need to "fit" closely.