I've mentioned the same thing a few times, but not many people agreed. I don't think it was because he knew he was being recorded, but I thought/think he may have dressed that way so anyone who saw him from a distance might think it was RL. If he did disguise his voice too, I'd say it would be more likely that he hadn't originally planned to kill them and didn't want them to be able to recognize his voice.
I'm not sure how cold winters in Indiana usually are, but I know he would be considered overdressed for 40+ degrees in this area. I could see wearing a hoodie or a jacket, but not both. Obviously, many others think Abby was underdressed, and some people probably think he was too. To me, he just looks like he was trying to look heavier than he is, but I could be wrong - there's a first time for everything! :thinking: