Watson had taken a painstakingly long amount of time to make sure he had gathered all of his belongings before moving out of 221b Baker Street, so how could he have forgotten his absolute favorite coat? It was the one he wore all the time and so he couldn't just leave it there to get lost under piles of junk and experiments gone wrong.
He let himself into his old residence with the key he still kept in his pocket and was overwhelmed with the feeling of home. It looked like home, it even smelt like home and he couldn't imagine ever feeling the same way for Cavendish Place, no matter how hard he tried. With a sigh, he ascended the stairs, passing Mrs. Hudson on the way who stopped him to chat and asked how he had been doing.
He plastered on a broad smile and told her everything was going beautifully and that he was looking forward to being completely settled. When she let him pass, he went directly to his bedroom and looked about for the missing coat. It almost shocked him