I believe students should be allowed to continue wearing their PE kits on PE days post corona. I think many students have felt more comfortable not having to change in front of class mates and would benefit from not using the changing rooms. This will also impact the amount of learning the students have during lessons due to the time it takes to get changed at the beginning and end of the lesson. In theory one will lose 10-20 minutes or PE time because everyone has to get changed first. 
This makes it more practical for both students and teachers and will benefit many students well-being.