@guildwriter: the haircut isn't the only reference to Sonny Rollins.
As usual, the chapter title is a reference to a jazz song, and this time it's named after Sonny Rollins' 1975 song "Are you Ready?"
https://www.youtube.com/watch?v=MYWWKvVHsrM
@guildwriter I don't think it will be that one. You see, that's just a long buzz cut, many other jazz musicians had a similar haircut, it's too common. It's very unlikely that somebody would ask for that hairdo using specifically Sonny as a reference.
If we're talking about a haircut that's iconic to Rollins, that would be the mohawk: