As tempting as it seems to wear tennis shoes with your tux, don't do it. I think it looks ridiculous. If you're 14 years old, maybe give it a shot. In general, don't portray anything that says 'I'm too cool and I don't care.'
Men who are not given any voice in this because of the secret nature of the courts, what they're left with is dressing up ridiculously, but at least using humour to try and draw attention to their kids.
Mankind are divided into sects, and individuals think very differently on religious subjects, from the purest motives; and that gracious common Parent, who loves all his children alike, beholds with approbation every one who worships him in sincerity.