Iowa HS girls put a rule in this year that you can't fold down the waistband of the pants or tuck in the legs into and compression shorts or anything else underneath. Think the sports have been getting a little too long and now girls are being bothered by them. I have seen HS boys teams starting to shorten up the lengths also.
Shorts in my day were too short, but shorts were basically becoming like hemmed up pants with as long as they were getting. When they are so long that they still cover your knee when you bend it up, you have to have them quite baggy to avoid restricting movement. Think they finally found the tipping point in the length.