Yeah, I love Boris' work, but it's a complete fantasy interpretation of everything..
And that was promotional work not actual production art and it was after the movie?
Not really relevant, but still very cool to look at.
As far as the colour of the jacket goes. I'm sticking with my theory. It was a bad dye job. If you dye a cold colour over a warm colour (like blue over brown) the colour underneath shows through at times depending on the environmental light. Solo's coat was intentionally BLUE to separate him from the other troops and to match his colours for the rest of the movie. The brown prop coat? The dye has just faded over the years..
So I suppose everyone is right, but the intention was blue..