What is appropriate / best dress for National Anthem?

Hi!

Need help deciding whether to wear a hot white shell with a matching white jacket or a much cooler, dressed up red t-shirt with white pants and white-soled scandals?

Now, the hardest part of this is to somehow wear something that can go with white-soled scandals for singing on the tennis court...yes, it is not permissable to wear any shoe that would scuff the court.

Thanks for any help!!!!

Cherylsop