In his testimony Whaley said they looked like faded blue khaki pants.
Mr. BALL. Did you notice how he was dressed?
Mr. WHALEY. Yes, sir. I didn't pay much attention to it right then. But it all came back when I really found out who I had. He was dressed in just ordinary work clothes. It wasn't khaki pants but they were khaki material, blue faded blue color, like a blue uniform made in khaki.
Oswald's possessions from his room. The pants right above/underneath the sign?
Probably helpful to show him a photo of the pants/shirt/clothing?
Correction: They did show him photos of the shirt/pants:
https://www.history-matters.com/archive/jfk/wc/wcvols/wh16/html/WH_Vol16_0271b.htm