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You can wear anything to an aerobics class, but if you're serious about your workout, look for exercise clothing that's not only moisture wicking, but breathable for extra ventilation, since a crowded aerobics class can get hot and stuffy in no time. As for your bottom half, the same principle applies; shorts or sports pants with mesh insets can keep you comfortable, even when you look at the clock and realize that you're only 15 minutes into the class.
Caution: Be mindful of long pant legs if you are taking a step aerobics class; you don't want to catch a flared pant leg on the step.