[Avodah] To Stand or Not to Stand for a Chosson and Kallah

[Isaac Balbin]

As I recall, the Rav, RYBS, was quite literal in treating the C&K as Melech and Malka, thereby necessitating standing.
For this reason, he even refused to be Mesader Kiddushin for a C who wore a straw hat, as this was not appropriate
for a Melech.

In Melbourne, people are casual about what they wear at a Chuppa given the Chuppa usually takes place on a Sunday
3-4 hours before the Chassuna (and going to the Hall). Rabonim who come from outside Australia have always remarked that
it's not appropriate to dress casually in the presence of an M&M. Then again, Queen Elizabeth was just in Melbourne, and 
I'm not sure that those who lined the streets to see her got dressed up for the occasion. Notably, though, those who were
in private audience or who were officially involved, were dressed to the nines (even with tznius, and many women wore hats).

There is a question about precisely when the C&K become M&M though in respect of standing up.