6

The sentence goes:

A good judge, like a good umpire, cannot act as a partisan... If you are playing the Yankees, you don’t want the umpires to show up wearing pinstripes.

I cannot understand the part after the ellipsis. "Show up wearing pinstripes" seems to be a proverb or slang. Could anyone help explain?

5

It's an illustration of the rule expressed in the preceding sentence. If you want to be (or appear) impartial, do not wear the uniform of one of the teams.

The [Yankees] home uniform is white with distinctive pinstripes and a navy interlocking "NY" at the chest.
Wikipedia

16

In American Major League Baseball, the New York Yankees traditionally wear pinstripes on their uniforms.

https://ftw.usatoday.com/2013/04/yankees-pinstripes-origin-babe-ruth 1

Thus, for the umpires, who are supposed to be impartial judges, to "show up wearing pinstripes," would suggest they were, in fact, favoring the Yankees.

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