I'm all for extra accessories and am looking forward to the figure, but it is odd they've chosen the coat he wears for only a few minutes in the entire series - while he's talking to Harry. Sirius goes to King's Cross as Padfoot and then jogs in to a side room. So, it's supposed to be a coat he's found in there to cover himself up with, not his own coat. Still does look cool though. I hope they bring out the Azkaban clothing set too!
Mind you, he does have a photo of the Order of the Phoenix on him, so how did he carry that? *Shudders*. Maybe he used a summoning charm - "Accio photo and giant fluffy coat."