I am going to see Phantom of the Opera next Saturday. It's a matinee. What should I wear?

I am a 32-year-old woman, going with my mother in law and teenaged niece. The last time I saw this show, it was at night, and I was a college student...so I dressed up a bit in a floor-length gown. Do I dress down some since it's a daytime show? I'm not made of money, so whatever I wear will have to be something I already own. Things I do have...nice black dress that could be for office wear or out to dinner; black slacks with slight bits of silver glitter, a couple of nice shirts, both short and long sleeve; short black skirt, long and swingy gray skirt; some sweaters. This is Florida, so there's no need to bundle up. Also, the only nice pair of shoes I have left is a pair of pink high heel sandles. Could I wear these with the black dress? Or maybe the black pants with a pink shirt? The dogs ate all my black shoes. Thanks for any and all advice! (I'm pretty clueless in this department, obviously. LOL)