Business casual is a safe bet, but it really depends on the performance. The Schuster is a very welcome space and people wear just about anything. For performances like the Nutcracker people tend to dress up a little more and make the night special. For music and comedy performances you will see jeans and show stopping outfits, Philharmonic performances, comfortable business casual. In general the dress code ranges from jeans and khakis to suits. Big days like New Year's Eve for the Phil you may see a tux.
Peace Onfifth is right! You’ll see everything from t-shirts and jeans to suits and dresses – and everything in between! The theatre can be chilly, so you may want to bring a sweater or jacket. Please be careful about wearing perfumes and colognes when attending the theatre. Many have allergic reactions that impair their enjoyment of the performance. You can see answers to more frequently asked questions at https://www.daytonlive.org/about/faq/.
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