Maria Sharapova took questions and chatted tennis fashion with rec. players recently at the Sony Ericsson Open. Take note of the first question from Anna.
No surprise to me, an avid "older" player looking for stylish on-court apparel that offers coverage from the sun. I'll add, coverage that doesn't cause heat-stroke. You simply can't play hard under the sun in the long sleeves on the market today.
I like what Maria is doing with her Nike line. Let's hope she takes this request (and the one for her apparel for plus sizes) to the drawing table. She'll have an even bigger following if she does.