"...the Oswald stand in "
Would that not be the Oswald sit in? 
For our audience for the umpty-umpth time----https://www.jfk-assassination.net/russ/testimony/baker_m3.htmThat multi-colored jacket keeps showing up...going from light brown to grey to white to blue and back again. 
John posted this on a different thread to demonstrate the "multi-coloured jacket" phenomenon is not as rare as you might think:
In the following image is shown the man wearing BLACK who in and around Port Arthur killed 35 people and many eyewitnesses were face to face with this mass murderer and positively identified him and later this man admitted to the crime.

These eyewitnesses all positively identified the same man and understandably have differing memories on the clothing colour but if we use the same criteria of throwing out eyewitnesses because of a silly colour discrepancy then we'd still have a mass murderer on the loose. And this highlights the problem with rabid JFKA CT's, outside this single case, they have no real life experience!
Name of Witness: DUTTON Christian Names: James David brown jacket
Name of Witness: KINGSTON Christian Names: Ian Gregory green jacket
Name of Witness: BEEKMAN Christian Names: Michael Dean ski type jacket, blue, orange and a few other colours on it
Name of Witness: WILLIAMS Christian Names: Colin Sydney 3/4 length jacket, dark in appearance
Name of Witness: WILLIAMS Christian Names: Iris Emelia He had on a jacket of some description.
Name of Witness: SARGENT Christian Names: Michael Robert blue jacket
Name of Witness: RIVIERE Christian Names: John Michael “High length’ black jacket
Name of Witness: OLSON Christian Names: MARY LEE I think was green
Name of Witness: LEVER Cristian Names: Coralee Helen dark jacket
Name of Witness: NASH Christian Names: Carolyn Louise khaki green jacket or parker type jacket
Name of Witness: BALASKO Christian Names: James black jacket
Name of Witness: McKENNA Christian Names: Rebecca Kate ski type jacket which was zipped all the way up. it was either navy, blue or grey.