Im in the camp that "Both" are correct. there is nothing wrong with either choice. Its just your personal preference. No one can deny the jacket is Brown, and no one can deny that it looks blue, it appears as both colors during different scenes. Its just whatever you prefer. I personally like the brown, because thats its natural state, but blue is just as good because it definitely looks blue.
I agree. Nothing wrong with either choice.
Like you said, it all comes down to personal preference. All the debating/arguing is silly and pointless, IMO.