While B9 robot builders have no inherent interest in the Bermuda shorts, I found it very peculiar that the Bermuda shorts of the first season were so obviously dissimilar to the regular first-season legs.
 

Look at these screen grabs of the robot wearing his Bermuda shorts.

In the screengrab above, you can see the the Bermudas terminate without any knee plates. In this shot, you can also see the power cord trailing from the bottom of the back of the Bermudas.

Notice anything odd?

First, the top bellow of the rubber legs is drawn up over the waist plate. Second, the vertical crotch cleavage that is so emblematic of the first-season legs is absent. In this respect, the first-season Bermuda shorts foretell the second-season regular legs. As for the missing waist plate, I cannot imagine what the prop men and producers were thinking. Did they really think that no one would notice? Well, if they did, they were right. As a youth watching Lost in Space on a daily basis, I never noticed this garish and glaring inconsistency. Now, I cannot imagine how I never noticed it before.