http://www.baltimoresun.com/sports/high-school/bal-va.cross27oct27,0,54315.story

Many sports have uniform rules but there is no penalty associated. For example, in high school basketball girls cannot wear prewrap around their head unless it is black, white, beige or if it matches the dominant color of the jersey. Its the officials' job to make sure they do not wear something outside of that. If they do the official instructs them to leave the floor or take it off immediately. It would be silly to issue, say, a technical foul for this.

 

So, this is an absurd rule IMO.

I know Cross Country and Track and field are very particular on this. I remember a coach making my son remove his under armour shirt as the white 'H'or 'U' or whatever it was, was visible. It had to be a totally solid color (blue) if he wanted to wear during the race. I thought it was dumb then, and I still think it is dumb.