First of all this rule has been around for about 3-4 years. They gave schools long enough to purchase new uniforms to comply with the rule like many equipment rules are set a few years in advance. Secondly, you have to wear white. You cannot wear a light color like gold, silver, yellow or gray as a home uniform color. Now the primary color has to be white. I am not at home right now and I do not have my books to see if there is an actual penalty. I am sure this would be something for state organizations to deal with more than the actual court officials.
Schools have had plenty of time to comply with this rule, so at this point if you were unaware; someone has not read a rulebook in a while.
Peace