Pink.

Not one of Nigel's favorite color and that is one of the reasons he did not own anything in that color. He did not really have anything bright either. Why would he ever need bright clothing unless he was running at night when he was home. Which he did not. So normal clothes it was. It did not say mandatory, only preferred.

And what were those things?

Nigel kind of wanted to kick them and see what happens. But the two Professors and the Librarian put a stop to him actually wanting to do it. "Hello Professors and Hello Mr. Kitridge"

Still Nigel had to rub his eyes from all the bright clothes in this 'play pen' thing.