It depends on who does this, but this could definitely be seen as a positive externality.
"I'm wearing my bikini," Corinne said as she unbuttoned her overcoat outside the terminal to reveal a black two-piece. "It's not that I'm concerned, it's that I feel like the TSA is making travelers feel uncomfortable, and I feel like we can have security measures that don't make people feel uncomfortable.
The young lady in the embedded video? Positive externality. Definitely positive. Me in a Speedo? Let's not go there.