Changing shirts creates no issue even if that occurred. The fibers from his shirt could have got on the rifle on some prior occasion. They would not necessarily have needed to be on the rifle from contact on Nov. 22. What the fibers do is add yet another link between Oswald and the rifle left at the crime scene. The rifle used to assassinate JFK. Even if no such fibers were ever found, there is ample evidence to do that from the overwhelming evidence that links him to the rifle. Whether he changed his shirt or does nothing to undermine the case against Oswald.
Changing shirts creates no issue even if that occurred. The fibers from his shirt could have got on the rifle on some prior occasion. They would not necessarily have needed to be on the rifle from contact on Nov. 22."Richard" is grasping at straws again.
First of all, there is no such thing as
"the fibers from his shirt" as it never was (and never can be) conclusively proven that the fibers found on the rifle did actually come from Oswald's shirt to the exclusion of all other shirts. At best the FBI experts could say was that the fibers were similar.
Secondly, the only realistic time that fibers of the arrest shirt could have gotten on the rifle is on November 22, for the simple reason that - according to the official narrative - Oswald surrendered the rifle, wrapped in a blanket, to Ruth Paine, when she picked up Marina in New Orleans, in September 1963. Oswald visited Ruth Paine's home only a couple of times and simply would have had no real opportunity to have access to the rifle and/or break it down. But, let's say for argument's sake say that there was indeed a rifle in Ruth Paine's garage and that Oswald could have somehow managed to dismantle it, without being seen, that still requires that he just happened to be wearing the arrest shirt on that occassion, and that would be one massive coincidence.
Also, the likelihood that fibers similar to those of the arrest shirt could have gotten on the rifle before November 22 and stayed there is extremely low, considering that not a single single fiber similar to the fibers of the blanket, in which the rifle allegedly was wrapped for more than two months, were found on the rifle. Do the math!
What the fibers do is add yet another link between Oswald and the rifle left at the crime scene. No they don't provide such a link, as the fibers found on the rifle were never matched conclusively to Oswald's arrest shirt.