These are already available in game and have been for approximately 1 to 2 years.
ravenloft specific surcoatsas in.. the morninglord crest, ezra, hala, some of the Core's family house crests etc
as i mentioned in the original post
not the ones that are already available. its a template so you can add your own
since the hak is being updated soon this is probably the last chance to put such in