I can't say if it was the coat, but.....
It wasn't. Why would a demon inhabit a coat? why not a person? why not the family pet? Why a coat? It don't make no sense! People have bad dreams sometimes. I was on a fishing boat yesterday and laying down in a bunk in 6 foot swells with people throwing up all around me and I have one of the best dreams I have ever had and woke up at full attention. Maybe the waves were infected with a succubus making me all happy.