[officialtony]

I would have agreed with you until my association meeting last week. We were told that rolled down waist bands are OK. By the way, I have seen some of the local soccer teams wear their soccer shorts waist bands rolled down. Not all of the players do it, but some have - and the officials have chosen not to " see it " or ignore it.
With soccer or basketball shorts, I can see not wanting this. With all the running and jumping, the baggy shorts would constantly need adjusting or may become unsightly.
In Volleyball, the shorts are so tight that usually once rolled, they stay rolled without further need for adjustment ( at the waist band ).

Just my opinion.