Yawn!
Here we go again with Weidmann the Legal Layman now becoming a Forensic Specialist Layman, what a Goofball!
Famous Cases Solved by Fiber Evidence
Wayne Williams (Atlanta Child Murders, 1981): This is considered the first major case solved primarily by fiber evidence. Yellow-green nylon carpet fibers and violet acetate fibers found on several victims matched the carpet and bedspread in Williams' home and car.
The Yorkshire Ripper (Peter Sutcliffe, 1981): Specialized fibers, specifically unique bank-note-like fibers found on several victims, helped link crimes together and matched clothes, ropes, and the car of Peter Sutcliffe, supporting his murder convictions.
Timothy Evonitz (2001): The serial killer was linked to the murders of Virginia girls Kati and Kristin Lisk and Sophia Silva through unique blue fibers found on the bodies, which matched a blanket and other items found in his car and home.
Jeffrey Macdonald (1970): The Army doctor was convicted of murdering his family after fiber evidence from his pajamas was found in the mouth of a victim and throughout the crime scene, contradicting his claims of fighting off attackers. The Oswald shirt fiber evidence had 3 types of fibers on Oswald's rifle matching the three types of fibers on his shirt and is just another piece of evidence linking Oswald to the rifle.
Oswald ordered the rifle.
Oswald purchased the rifle.
Oswald was sent the rifle.
Oswald was photographed with the rifle.
And a team of amateur Johnnie Cochran wannabes could never refute this reality! LOL!

And as for the blanket fiber in, not(as claimed by the dishonest Weidmann) on Oswald's rifle bag would take a number of experiments to calculate the probability of a magic fiber penetrating the bag.
In the following photo we see the opening of the bag sitting on top of the blanket and since there is no timestamp we don't know at what stage this photo was taken, was the bag already analysed? Was the photo taken in Dallas on the 22nd and if so how far into the bag was a fiber found? Was the bag folded when sent to Washington? Our resident Forensic Layman says that all the evidence was sent in a single bag, which wouldn't surprise me considering the level of scientific forensics at the time, and if so how far into the bag was the fiber and as I said was the bag folded?
I'm guessing without these issues being fully addressed, a real Johnnie Cochran and the best fiber forensic scientists could bring up some doubt but the fact remains that the Oswald prints on the rifle sized bag will forever link the bag to Oswald.

JohnM