Well, so far everyone but the groom is against it, but the groomsmen (who are all being rented vry proper attire as far as I can see) finally agreed to wear it "If Amy wants us to." Which she doesn't.

(Also, there was a very funny scene involving the prospective mother-in-law toasting her son's marriage to a divorcee as "To Stewart's first marriage. Oh dear, that came out wrong.")

At least, the groom is giving out a lot of information and being quite tolerant of people's comments, even if everyone else is treating it as a joke.