Trying to ID an SF story I read years ago

The story took place on a planet named something like Iatria. The main character is some sort of covert exploration agent from off-planet, trying to observe the locals without being detected as such. He meets a young woman who works in a record shop, who shows him around. Late in the story, they are captured by local officials, and he uses buttons on his clothes to save himself & her. One is apparently a communicator with his ship, and another some sort of compact grenade.

I'm pretty sure it was a short story in an anthology book.