When I go to concerts and shows I typically dress as if I'm going to work. My work is business casual - slacks, blouses, etc. My rule of thumb is "Would I be embarrassed if I ran into the president of my company in this?" (that actually happened to me once lol). You can take a nice blouse and slacks and "dress" it up with cute shoes or jewelry.
What you have in mind is fine IMO
"All our dreams can come true -- if we have the courage to pursue them." -- Walt Disney
We must have different Gods. My God said "do to others what you would have them do to you". Your God seems to have said "My Way or the Highway".