Oh man, why was I sleeping when this was posted? I basically do two kinds of clothes shopping on Amazon: regular brand items that I stalk until they're really, really cheap, and trendy things from those weird Chinese brands. If you add things to your wishlist and/or camelcamelcamel, you can watch them. Sometimes the prices just dip for no apparent reason, and you can get really great deals.
Cheap lucky finds:
Trendy Chinese finds: