I used to have the same theme when I performed in primary school. I can give you a reference. The upper body is a white tube top exposing the navel (if you think it is unacceptable, you can change it into something else), and the lower body is a skirt, a skirt dancing with faint tassels. Generally sold in performance clothing stores, you can choose sandals or dancing shoes. I hope these suggestions are useful to you and wish you a successful performance.