So while playing Pokemon Y, I've noticed in the "PPS" Passerby section that some trainers have what looks like unique clothing: one guy had a red military-esque uniform, another person was wearing the black leather jacket and had that green tuft of hair that the punk dudes have. I've seen a girl wearing the black coat and hairstyle of some of the normal trainers (I think the Ace trainers?). All of them were other players (they had non-standard names, like gibberish).
I'm not too far into the game (going to take on the 3rd Gym in a bit), so I might be missing something. Are there unique outfits that can be bought/unlocked? Is this DLC that people have hacked onto their characters? I can try to get some pictures if anyone needs a visual aid.