Probably depends a bit on what the venue for the show is. The overall aesthetic for the crowd will be dressier in a dedicated Opera house compared to say a community theatre venue.

My personal opinion is that floor length is probably a tad overdressed, but I wouldn’t worry too much though. If you want to dress fancy then do your thing girl.

It’s not like he’s going to see it!

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I think it is appropriate. Add a shal

Depends on your figure