Men wear bras (because they have moobs), men wear panties (because they cannot find cute underwear for men), and there are of course, full-fledged crossdressers, or even more interesting, men in skirts (well, these are kilts).
So why would men wear pantyhose?
For the same reason the women do. And like underwear, it is something that men can do without being stereotyped by others as gay or just weird in some ways. The interesting part is that many men are choosing printed stockings and patterns that cannot be described as those on one’s socks. In other words, if you are one of those men, who would like to wear pantyhose either for aesthetic or medical reasons, the time has come.