Vanity, vanity... all is vanity.
What difference does it really make?
If the association you're auditioning for is a solely collegiate association (or, alternatively, led by collegiate umpires), I can venture an experienced guess why they perseverate on sartorial details like this. Insidiously, it's not someone who's 80 years old; oh no no, instead, it's someone younger... think mid-40s / 50s...
What's absolutely maddening, is working for one particular association/assigner, who insists that we are to "look like the Big League guys", yet another association – often at the same or similar level of competition – insists, nay mandates, that we are not "Big League guys" and we will never wear that style of uniform (ie. shirts, shirt colors (ahem, Wisconsin just a few years ago), jackets, pants, etc.). Like that assigner / association head has a chip on his shoulder, or a grudge against the Big Leagues because he... oh... ohhhhhh... I get it. 😉
Again, if you provide the uniforms, then you have all the control and justification of directing what we wear. If ya don't... If you're too freakin' cheap or that much of a control freak over your little fiefdom...