I want to see an Opera when I visit Vienna. Since the all the cheap seats have already been sold, I plan to pay €3 for a standing room ticket. I'm guessing the standing crowd will not be as well-dressed as the €190 seats. How nice should I dress? Do I need a tie? I was thinking nice slacks and a long-sleeve collared shirt.
The overall rule is to look presentable and avoid showing up in travel attire. A sport coat and a pair of slacks should be just fine for any performance. A nice blouse with slacks or a semi-formal dress would also be a good choice for the ladies.
Still, dressing up can be half the fun of going to the opera! So if possible, feel free to wear that stunning dress or suit you rarely have the chance to show off.