The testimony took place on March 10th, 2021. Bill HB120 ( The Inclusive Attire Act ) was passed into Law in the Summer of 2021 and is now in effect.

For more info:

https://www.billtrack50.com/blog/inclusive-athletic-attire-act/#:~:text=The%20Illinois%20Inclusive%20Athletic%20Attire%20Act&text=This%20bill%20allows%20all%20student,or%20leggings%20with%20their%20uniforms.