Appearance-Based Impressions Drive Real Outcomes
Todorov et al. (2005), published in Science, showed that appearance isn't just a bias — it has measurable real-world consequences. Inferences of competence based solely on facial appearance predicted the outcomes of U.S. congressional elections better than chance — correctly calling 68.8% of Senate races in 2004 — and were linearly related to the margin of victory. These inferences occurred within a one-second exposure to candidates' faces.
In other words: if a one-second glance at a face can predict an election, imagine what a poorly dressed executive communicates to a client, investor, or board member in the first moments of a meeting.