Had this issue come up a few years ago.
A first-year manager and his assistants popped for MLB replica jerseys with their own names on the back. They all came with the number 00 printed on the backs as well. They wore caps, blue jeans or shorts and tennis shoes during games. The team wore the MLB T shirts (with LL patch) that the league provides with their uniforms.
While the coaches' replica jerseys looked nothing like the kids' T shirts and the full manner in which they were dressed looked nothing like the kids' uniforms, they were told they could not wear them during games because they were wearing a uniform shirt.
While I took the spirit of the rule to mean coaches couldn't wear an identical shirt that matches the kids' uniform, the league took the rule to mean that any shirt with a number on the back constituted a conventional uniform. I thought the rule was so that younger players (Majors and below) didn't get confused during a play by base coaches dressed exactly like players.
What's your take on this? And what is the intention of the rule to begin with?
"Managers and coaches must not wear conventional baseball uniforms or shoes with metal spikes but may wear cap, slacks and a shirt."