what if they think…?

They walk at this dark parking place in their comfortable clothes, jeans and sweater. Its late. He sees something, probably another trail and walks further up. She waits at the street under a lantern. After a while she is starting to feel uncomfortable and shouts
“Hey come back! What if someone thinks I’m a hooker?”
He shouts ”they won’t.”
She asks him how the hell he knows “You are not in work clothes.”