Re: uniforms
At my hospital, we used to have nurses in one color, PCA's in another, housekeeping in still another, etc.
Patient surveys revealed that they still didn't know who was whom.
The restriction was dropped and morale rose as we were finally allowed to wear the scrubs of our choosing.
In my opinion, nurses need to introduce themselves to their patients, write their names on the room blackboard or dry erase board, and conduct themselves professionally. These measures have more of an impact than the color being worn.