During Atticus’s speech, Scout sees him do two things she had never seen him do before. What are they?

From the text:

Atticus paused, then he did something he didn't ordinarily do. He unhitched his watch and chain and placed them on the table, saying, "With the court's permission-"
Judge Taylor nodded, and then Atticus did something I never saw him do before or since, in public or in private: he unbuttoned his vest, unbuttoned his collar, loosened his tie, and took off his coat. He never loosened a scrap of his clothing until he undressed at bedtime, and to Jem and me, this was the equivalent of him standing before us stark naked. We exchanged horrified glances.