There is a tiny ritual that happens on tennis courts everywhere. A player finishes a point, turns toward the baseline, and gives her waistband a quick tug. Or pulls down the hem of her shorts. Or checks, almost without looking, that a white skirt is still covering what it is supposed to cover.
The adjustment takes a second; the distraction can last much longer.
Really, the dream of good tennis clothing is not that everyone notices it, but that the player does not. The best outfit keeps up with a serve, a sprint, a low volley, and a desperate reach without rolling, pinching, going sheer, or asking to be fixed between points. When it works, it almost disappears. When it does not, the player suddenly has two problems: the match and the clothes.