Re: TNG uniform question.
In TOS they also used the ship's emblem to define the divisions. The definitions pretty much carried over to TNG. Though there were the occasional slips where the emblem didn't match the shirt or the shirt and emblem didn't match the job.
The boring one, the one with Khan, the one where Spock returns, the one with whales, the dumb one, the last one, the one with Kirk, the one with the Borg, the stupid one, the bad one, the new one, the other one with Khan.