Many designers make their clothes in Hong Kong and Mainland China. You can usually find really cheap name brand designer fashion if you know where to look. Usually you can get at least half price, and sometimes you can find prices up to 90% off normal retail.
Here is a list of designer factory outlets in Hong Kong. If you plan to do any shopping, you can find great deals on brands like Prada, Helmut Lang, Adidas, Ralph Lauren, Alexander McQueen, and more!