This is the best summary I could come up with:

But in recent years the events have been marred by incidences of voyeurism, in which female members of cheerleading groups, often dressed in sleeveless tops and short skirts, are photographed without their consent, with the images posted online in some cases.

Earlier this week, girls from Takasaki high school in Gunma prefecture, north-west of Tokyo, performed in shorts that had been designed to complement the uniforms worn by its baseball team.

“Voyeuristic photos can potentially cause lifelong emotional damage to our students,” said Takasaki teacher Kohei Shiozawa, according to the public broadcaster NHK.

In 2020, the Japan Olympic Committee described upskirting and other forms of secret photography targeting female athletes as “despicable”, warning that it would empower stadium officials to check images taken by spectators during the Tokyo Games.

The sportswear manufacturer Mizuno has developed a special fabric it says will deter voyeurs from secretly using infrared cameras that produce a “see-through” effect.

The firm plans to make the textile commercially available for track and field uniforms, sports bras and swimsuits, according to the Asahi Shimbun.

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