The inseam does make sense. Keep in mind Ewan isn't considered very tall (5'9 or something) and as stated, Browne's signature is his high hemmed trousers. EDIT: Looked up his height, most everywhere says 5'10.5, which seems to make sense.
What bugs me is that this is being sold as a "suit" and not a light overcoat and odd trousers, which is what they really are. If they were selling one of his actual suits (like the one in my avatar) I think there'd be a little more interest from the Browne afficionados. I might consider bidding if it's going this low. Not to wear said items, but display them. More like a geeky, "My favourite actor wore this," sort of thing.
kitonbrioni: Did you even look
at the listing? Sure, they're "ordinary" khakis, but last I checked pretty much everyone here has a pair, including yourself, no? Also, you can see in a close up shot (which I couldn't see when I rented the movie) that the overcoat is a nice charcoal herringbone.