In most of the color episodes, Jethro is wearing a red checkered shirt. However - in a few episodes - he is wearing a blue checkered shirt (e.g. season 5 - "The Flying Saucer").

Any reason for this?

The red one was in the wash?

The red one was in the wash?
LOL!! :lol: :lol:

Uh, people DO wear different shirts occasionaly, do YOU wear the same shirt EVERY single day?

Anyway Jethro wore a red checked shirt, blue checked, green checked, and it appeared a BLACK checked one once, but it could have been blue.