Hilarious. The FBI has no need for anyone to confirm what shirt Oswald was wearing that day if, as you suggest, the fibers don't have evidentiary value. They already know that the arrest shirt belongs to Oswald because he is wearing it when arrested. They already know that the fibers are found on the rifle. To the extent that the fibers are being used to link Oswald to the rifle, there is no need to have a witness confirm that he wore the shirt that particular day. And if Bledsoe is not being coerced and Oswald wasn't wearing that shirt on the bus, then there is a significant risk that she confirms he was wearing a different shirt. Why would she say otherwise? Again, however, it makes little difference what she says either because there is little value to the fiber evidence or because fibers from Oswald's shirt could have gotten on his rifle on a prior occasion.
Take it up with the FBI. They were the ones who went to Bledsoe. They must have had a reason for it, don't you think? Now, try to think really hard, "Richard", what possible reason could they have had for taking that shirt to Bledsoe?
You know what, I'll give them a call first and let them know that "Richard Smith" doesn't agree with their methods.
Oh, btw, before I forget. Yesterday I was looking through some old documents and found several FD 302's I had forgotten about. They showed that the FBI not only took the arrest shirt to Bledsoe in early December 1963, but also to Truly, Reid and several other people. It seems they were desperate to find confirmation that Oswald had been wearing his arrest shirt all day. None of the other people they showed it to recognized or identified the shirt and they all gave a different description of the shirt they had seen.
All, except one; Mary Bledsoe..... and guess what, that's the one the WC went with to claim that Oswald had worn his arrest shirt in the morning. All the other statements went straight into the archives..... Go figure!