The Attic

I noticed a weird discrepancy between LNs and their illustrations that seems to crop up a lot.

I first noticed it in (cokesakto's) translation of KnK. Art: Red jacket. Description: Black jacket.
This wasn't consistent, so I chalked it up to translator error.

Then I saw the same thing in Boogiepop. Art: Purple cloak. Description: Black cloak.

I've seen this happen a few other times, too. So is this just translation problems? Artists taking creative liberties? ...