I now have a headcanon that Aziraphale likes to wear scarves because he grew accustomed to having Crowley perched around his neck and shoulders back when he took the form of a snake, He does this subconsciously, But Crowley still has a habit of sort of curling up against Aziraphale's side when they sit next to each other, And when it's cold or he's drunk Crowley will often lean his head into Aziraphale's shoulder or put an arm around his neck without really noticing it