I think the future uniform designs are just awful. Nothing works, from the fabric (which looks like it should be used to make window dressings) to the collar to the high-waisted pants. I also dislike the fact that the uniform tops are completely red/yellow/blue. They're just too bright. One thing I love about the current 24th century uniform is how the departmental colors are on the turtleneck, and the rest of the uniform is gray and black. Much classier.
Sure. Makes a lot of sense that you have to run up to someone and stare at their neck before you know what department they're in.
See http://www.chinfo.navy.mil/navpalib/ships/carriers/rainbow.html