Style consciousness -- and conscience

• smile;
• pay attention to your body language ("what am I saying with my gestures and posture?");
• only buy things you really love;
• spend on accessories;
• avoid "orphans" and "widows";
• when you buy something new, think about at least three items that you already have and can wear with it;
• always remember the "cost per use": if you pay 100 dollars for something you wear 10 times a year, each time you wear it you will be spending 10 dollars;
• be creative and try to modify your clothes.

Adapted from here.