From the book: after twenty years - Why doesn't Jimmy recognize Bob right away as "Silky Bob"?

Bob asked a stanger to pretend to be him so that jimmy wouldn’t recognize him.

Bobs face was disfigured when he was out west.

Bob is wearing a disguise so that police wint recongnize his face as the one of a wanted man.

It is nighttime, and all the stores are closed so it is dark outside.

Bob is wearing a disguise so jimmy wont recognize him.