You will want to wear performance activewear to a dance class since dance classes are typically high intensity. We do not recommend wearing anything that you cannot move freely in, like tight jeans. Stick with performance gear, like shorts and a tee shirt, or looser comfortable clothing, like baggy pants.
Please note that some dance classes may require special attire, so please consult with your class instructor if you have any concerns about what to wear. Additionally, when studios require specific attire it will be noted in the venue description in the ClassPass app.