The writer mentions a couple of well-known examples (e.g. if you are holding a warm drink, you will rate other people as being personally warmer) but focuses on new research that suggests that your clothing can affect mental performance.
If you believe the white coat you are wearing is a doctor’s coat, you will perform better on a test of mental acuity than if you believe that coat belongs to a painter. But if you believe you’re wearing the painter’s coat, you become more creative.
Like Proposition Joe said on The Wire, “Look the part, be the part.”