since Red shirt man is fully visible, they must have thought that the public could be convinced the man was Lovelady, therefore took no steps to alter the Hughes film?
However!
A very strange 'mix-up' happened in late-February 1964 when Mr. Billy Lovelady was called in to the FBI office in Dallas to have his photograph taken:

The official report said this:

The reader gets the impression that the shirt described in the report ("a red and white vertical striped shirt") is the one in the photograph------------and hence that the shirt in the photograph is the one worn by Mr. Lovelady the day of the assassination.
Mr. Lovelady would later say that he was NOT told to wear the same clothes as he had worn 11/22/63 to the photograph session, and so he just brought what he happened to be wearing this day (2/29/64). By the time he made this clear, he was showing folks his 11/22 shirt:

Okay, but read again the report's description of the shirt: "a red and white vertical striped shirt".
Note that there is
no mention here that the shirt was short-sleeved, which the shirt in the photograph obviously is.
Nor does the report state explicitly that the shirt Mr. Lovelady wore for the photograph session
was his 11/22 shirt.
What is going on here? A comedy of errors? Perhaps.
But I think what we're really seeing here is a
deliberate mix-up by FBI-----------------------one that created enough ambiguity to allow a certain impression to be given (
both the short-sleeved shirt in the Feb photograph and Mr. Lovelady's 11/22 shirt may be described as "red" and "white vertical striped"), while leaving room to correct that impression should folks notice the problem.
And why would such a deliberate mix-up be contrived?
Because the 'investigating' authorities didn't want to photograph Mr. Lovelady in his actual 11/22 shirt.And why not?
Because of Redshirt Man in Hughes
The authorities, who knew damn well that Mr. Oswald was Redshirt Man in Hughes, were a whole lot LESS spooked by the LHO=AltgensDoorwayman chatter than by the LHO=RedshirtManInHughes truth which no one had yet clocked.
NB! Only when the Martin film came to light did folks get to see Mr. Lovelady's 11/22/63 shirt for the first time:

After that, the ambiguity game could no longer be played..................
