I voted that a man should not be required to wear a t-shirt. A man should be able to evaluate each situation and act accordingly.....some work environments are very warm and a t-shirt would make a guy very uncomfortable....some cities are very hot (even with air-conditioning).
I am a married female and I can only say that after many years of marriage have learned that men and women have totally different thermostats!! My guy lays nearly buck naked in bed at night when I am under a quilt, so I have empathy for the guys.....then, they have the option to groom at the neck line. It is all negotiable as far as I can see.
Thanks for a fun thread!!!