Attire Affects Perceived Ethicality
Kristin Lee Sotak, Andra Serban, Barry A. Friedman and Michael Palanski summarized their findings from two studies of 700+ working adults in the Journal of Business Ethics. The authors found that casually dressed employees were perceived as less ethical than employees wearing business-casual attire. Whether or not participants considered the clothing appropriate for the workplace was the strongest and most consistent influence on their judgements. Formal attire did not always produce better ratings, and the type of industry mattered less consistently.
In other words: When an outfit is appropriate for the business setting, people may extrapolate that harmony as an indication of integrity and trust.