Speaking of which, I think i picked up some genuine Tommy Hilfiger boxers in Chungking Mansions in TST. Original price of $20 HKD each, but I bargained to get 2 for 30. Anyhow, normally I would think they are fake, but the stichting/finishing is pretty poort (threads hanging out and all) which makes me feel as if its definitely a factory reject...
In short, things can be found all over the place here. That's part of the fun.