I noticed, that dress code was not universally applied. Men usually wore jacket and tie, though I didn´t see any white jackets. Women generally wore long or at least knee-length dresses in rather conservative style. Far from as posh as in Salzburg, however.
I had heard that you´d dress more formally for Parsifal - but that was not my impression (see photographs below). On the contrary – the most formal dressing, in particular with the men, were seen at Götterdämmerung.
From Meistersinger intermissions: