I think its nice for him to openly display his faith, but a question to my Jewish friends — I thought a yarmulke was necessary only in the synagogue?
Orthodox follow the traditional teaching that it ought to be worn anywhere a man goes, outside of his bed. (There are picky legalities about exactly how far, so maybe walking over to the alarm clock doesn’t count, but that’s the general idea.) It needn’t be a skullcap/yarmulke, it can be a hat or a baseball cap, any covering designed for the head.
Less-strict varieties may only don the cap for ceremonial purposes, as in a synagogue or while at worship. The same goes for the fringed garment.
I'm not Jewish or particularly religious.
But only mad dogs and Englishmen go out in the mid-day sun.
A head covering is required anywhere a male Jew may require to pray. Even moderately religious people wear one because eating a snack requires a blessing.