"Pedestrians were more likely to think that a well-dressed individual was more likely to have the money to buy something in the store."

"Shop assistants thought the opposite. Those more familiar with the luxury retail environment were more likely to assume that a gym-clothes-wearing client was confident enough to not need to dress up more, and therefore more apt to be a celebrity making a purchase than someone wrapped in fur."

From a Wall Street Journal article titled, "Success Outside the Dress Code/The subtle cues that help nonconformists break from the pack and thrive; Power of sweatpants."