Putting on formal clothes makes us feel powerful, and that changes the basic way we see the world, says Abraham Rutchick, an author of the study and a professor of psychology at California State University, Northridge.
The data found that wearing a suit provided participants with "higher action identification level," "greater category inclusiveness," "enhanced a global processing advantage," and "felt power." In simple words: You are perceived by others as more powerfuland become aware of itthus further enhancing your own self-confidence. So, if you want that promotion at work, you're best to avoid a polo and khaki pants.
H/T The Atlantic