French Nymphet Ball Girls & Teen Tennis Players: Why Super Short Skirts?

I've been [unsuccessfully] doing research on the history of Catholic schoolgirl uniforms, and it dawned on me during a French Open broadcast, that like the male and female private school uniforms, there's a disparity between the length of the male and female tennis wear. 

As you can observe from the above GIFs, the tennis skirts of the nymphet ball girls and Fiona Ferro, the 18-year-old French tennis player, barely covers their hillocks. Consequently, their spandex covered hillocks are often exposed when they bend over, run or serve. But the shorts of the ball boys and the male tennis players almost always extend to their knees.

As one can safely assume that those teen ball girls and nymphet tennis players are causing a lot of nympholepsy among the French hebephiles, the questions remain: 

Who determined the length of the Roland-Garros ball girl uniforms? 

Who determined the length of the female tennis player uniforms? 

And who determined the length of the Catholic schoolgirl uniforms?

Pope Alexander VI's Teen Mistress: Giulia Farnese

Renaissance period Pope Alexander VI (1431 – 1503) was the Bishop of Rome from 1492 until his death. He is one of the most disputed Popes due to his adultery and nepotism. 

Alexander VI had a number of mistresses (and illegitimate children) but Giulia Farnese [Italian: Giulia la bella - Julia the beautiful.] was one of his most beloved. 

It isn't clear when their affair began, but when Farnese was 19 and the Pope was 62, Farnese moved into a palace next to the Vatican with Lucrezia Borgia - the Pope's 13-year-old daughter.

According to Durant's The Renaissance, Farnese was described as "The Pope's Whore", but she was good friends with the Pope's daughter. 

For some strange reason, Farnese was played by Lotte Verbeek, a 30-year-old actress, in Showtime's adaption of the life of Pope Alexander VI, The Borgias.