The authors texture structure defines the characterization by...
First, the character acts like a child due to the wife forcing him to put his gloves on but once Mitty starts driving away, he puts them back on.
The character is also speechless when he exits his daydream and is on the wrong lane which triggered Mac to yell at him and Mitty did not know what to say.
The character starts gaining self confidence when his wife starts to yell at him at the hotel, and Mitty starts to stick up for himself because he noticed what people were doing around him
The authors character structure defines him as acting like a child, speechless, and defines him as having self-confident.