Here are some tips to get you started:
Shop leisurely. Spend a few hours looking around because rushing leads to impulse purchases you may regret.
Have the proper frame of mind. Be open but not impulsive. There are many great finds by nondescript brands you may not have considered before.
Keep an eye peeled for overruns. But do a quick quality check (for runs, loose thread, loose buttons, etc.) before purchasing.
Think seasonal. In general, extremely trendy items can be bought on the cheap because next month another item or style will be hot (think ballet shoes, peasant tops and other passing flights o fancy). This includes shoes, accessories, tank tops and shirts.
What not to buy on the cheap: makeup. An allergic reaction will cost you significantly more than the price of cheapo cosmetics.
Another no-no. Also not to buy on the cheap: scents. Splurge on good brands. Knockoffs are never quite the same and you can smell the difference.
Great buy. What to buy on the cheap: casual shoes. Flip-flops, slip-ons and anything you dont intend to be wear for more than a few hours. For office shoes and pairs for those nights out, invest in killer heels.
Dont get carried away. Know your style and dont buy things just because theyre cheap. Youre not likely to wear them.