mastone, you are right. the coat underneath is only knee length. the over long thingy that looks like a dress but not as bad as ron's dress in hp4 - is long enough to dust the floor. it appears to have a few slits for individual leaves (??) of fabric. looks complicated as hell.



you probably seen this:

and this:


or another one - does not look like it would fly as it does in the movie, maybe he got differnent over coats depending on the effect the scene has to have