Listen to Mr Liu here with almost 30 years of experience of being a human. My observation on people is that for those who wear nice and smart. The possibility of striking hard in their life is high. Of course wear nice is not about branded shirt or expensive clothing. And also the body do tell the different at the same time. For being smart you will have to be fit and keep your body shape.
My theory here is that for those people who don't even bother to wear nice clothing on them as well as good body shape. They have already lost their motive in life. And I will say look around our environment, how many peoples who wear smart and nice will stay at their job position for long? So... use the external force to change your inner self. Try it and you will feel that a lot of thing is changing in your life