Mr Billy Lovelady

[Alan Ford]

Nope, still doesn't look like him...

[Alan Ford]

That Gif only shows Lovelady looking at Oswald after he has passed by and is facing the other direction. It's quite possible that Lovelady never recognized the individual as being Oswald.

Unlikely!

[Alan Ford]

What normal adult male remembers what shirt they were wearing on a particular day three months prior?

Mr Billy Nolan Lovelady (according to Mr Billy Nolan Lovelady)! 

[Alan Ford]

Enlistment Record

Thank you, Mr Scully (and Mr Crow)! 

I was obviously unaware of this. Is a scanned original document available anywhere?

[Alan Ford]

I believe that the person in red plaid shirt was Roscoe White.
He had a day off on 11/22/63 and I think he was the person seen in front of TSBD.
Soon after he went to DPD to check if he can help somehow and that we see him in Homicide office at 2PM.
Once the Oswald identity was set, two DPD teams were formed, one went to search Oswald rooming house and second team went to Ruth Paine home. Roscoe was picked to help one of this two teams and this is explanation how he got that back yard photo. Most probably he was the first person to find the photos and took one for himself.
There are not many Roscoe White photos available but sure the resemblance between Plaid Shirt person and Roscoe is much higher than with Lovelady.

Hmm, not so sure about that, Mr Jackson. Do we have a photo of Mr White from ca. 1963?

[Tim Nickerson]

Unlikely!

I disagree. Certainly not as unlikely as Oswald going unnoticed while standing on the entrance steps with a bunch of people who worked with him.

[Tim Nickerson]

Mr Billy Nolan Lovelady (according to Mr Billy Nolan Lovelady)! 

Right. As I said, what normal adult male remembers what clothes they were wearing on a particular day three months prior? Lovelady was wrong. He was not wearing his red and white vertical striped shirt.