Start with a black tennis skirt of your choice (like the below from Alo), then add a cropped tank or sports bra. If it’s chilly, throw on an athletic jacket, like this comfy one from Athleta.

Upon removing her jacket and voluminous skirt, Osaka revealed a black and white sleeveless tennis dress with a three-tiered ruffled skirt. On Tuesday, she wore a similar collaborative look in ...