clothes
A Victorian era gentleman was characterized as someone that did not need to "work" for a living. "Work" was manual labor of any kind. The gentleman often owned land and had a large income in comparison with those of the lower classes.
NBC Television Opera Theatre - 1950 The Would-Be Gentleman was released on: USA: 27 February 1955
There was opera and it attended often
Go on this link, I used it to find out about a gentleman, not sure about the lady though. http://www.victorianstation.com/gentle.html
Opera glasses <joke> Wear what you would wear to the opera in Seattle / New York / London / Paris / etc.
Nothing
For attending an opera in the afternoon, you should wear dress slacks and a dress shirt if you are a male. A female should wear a casual dress.
business wear
You should wear something presentable to a matinee opera, but less formal than for an evening performance.
Not all did.
pants,shirt,
suits