The influx of girls in wrestling spurred several rule changes to the sport for the 2020-2021 season.
According to a release from the WIAA and the National Federation of State High School Associations, female wrestlers will be allowed to wear a form-fitted compression shirt in addition to a one-piece singlet and a suitable undergarment, Rule 4-5-7 was rewritten to require that a legal uniform be worn during weigh-in and that no additional weight allowance be granted. This will allow wrestlers of both genders to weigh in at the same time. The rules committee also will be more lax with its rules concerning hair and stricter with wrestlers' shoes.
You can read all the rule changes here.