We're going to a concert at the Musikverein in Vienna on Saturday night (in the main hall). I'm really struggling to decide what's best to wear. What level of dress what would be appropriate for a lady? I don't want to be overdressed, but definitely don't want to be underdressed either. When I booked the tickets it said there was no dress code, but I'm fairly sure that if I took this at face value I'd feel pretty stupid!
I've had a bit of a search around the forum, but not been able to find anything clearly to answer my question. Any advice would be gratefully appreciated!