Dan,
It may well be that Roberts did indeed believe that Oswald walked out wearing a jacket, but that doesn't automatically mean that she was correct. Officer Baker thought that Oswald was wearing a jacket during the lunchroom encounter and taxi driver Whaley thought that the man he drove to Beckley street was wearing two jackets.
Totally agree with what you're saying here.
The irony of the LN hypocrisy is that when it comes to Buell Frazier, they will question anything he said about the paper bag Oswald was wearing. They call him mistaken and come up with all sorts of "reasons" why Frazier couldn't have seen the bag clear enough. The reason for this is that Frazier is saying something they don't like. But when it comes to Roberts, who says what they want to hear, her words as somehow written in stone, regardless of the serious problems there are with her credibility.
Mrs Johnson's testimony regarding Roberts' credibility is devastating.
Roberts' story about the police car outside seems suspect for a number of reasons.
But a detail like Oswald wearing a jacket on his way out....what does that gain Roberts?
It seems like a totally plausible, almost irrelevant detail. It only takes on importance because we all have it under the microscope for various reasons.
The way I look at it at the moment, the only reason Oswald returned to his room was to collect a gun.
It makes sense (to me) for him to wear a jacket to carry it in to make it as inconspicuous as possible.
I get the impression you're involved in a bitter LN vs CT situation that I'm not particularly interested in. It descends into a lot of nit-picking that often masks the valid points you have to make (IMO)
The LN narrative is an entrenched position that can only be really challenged by a strong counter-narrative that accounts for aspects of the assassination LNers struggle with. Endless arguments over little details have got nowhere, and never will (IMO)