
I don't believe Oswald had a place for "dirty laundry" per se. I see in the photo above (of items seized at North Beckley) what the inventory calls:
- "brown shirt"
- "pair grey trousers"


Pat Speer obtained a color photo of the North Beckley rooming-house shirt from the National Archives.

( Speer webpage: http://www.patspeer.com/chapter-4b-threads-of-evidence )
Oswald's arrest shirt has been published on the web in some odd ways:

(Above: Image on the left was probably taken with a modern digital camera and may be the most accurate of the three. )

TV image that I think could be brighter.
So if Oswald did change his shirt at the rooming house (and the shirt found there is that shirt), he put on a very similar (tone and color) shirt that he apparently had on when arrested. Therefore I can see why Marina thought the arrest shirt was the one he wore when he arrived in Irving on Thursday.
Two different shirts.
The one from the rooming house was a solid color.
The arrest shirt wasn't.
He changed his shirt and trousers at his room.
The shirt he was arrested in wasn't the shirt he wore to work on 11/22/63.
Officer Baker testified to the WC that he was wearing different clothes when he saw him at the police
station than when he saw him in the TSBD.
Fibers matching the arrest shirt to the TSBD Carcano point to a frame up not Ozzie's guilt.