I strongly recommend you buying tennis skirt. Cause it is specially designed for doing sports. The material is lightweight and sweat-wicking, keeping you in the best state when you do exercise. Besides, playing tennis is a vigorous sport, it calls for professional clothes. Yeah, it maybe a little bit expencive, but it's very practical. You can also use it go for a run. etc. While mini skirt makes you look unprofessional, most importantly, it feels uncomfortable and inconvenient .