What is the appropriate dress for a musical in Her Majesty's Theatre in London?

I intend to see Phantom of the Opera (evening show) during my short stay in London and I wonder what clothes should I pack.

To be honest, it is not really "dress code" and I think as long as you dress smart / casual you fit in fine. I think this applies to Her Majesty's Theatre, too, you do not expect to wear a suit and tie, or look for one million dollars. As you're clean! Say that if you do not turn to look super smart, nobody looks at you differently.


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