Re: who the fff... put Troi in that outfit??
I've heard it said that the costume actually makes professional sense. Putting Deanna in an outfit where her rank isn't thrust in the face of her patients. If they were contstantly being reminded (by the uniform and rank pips) that they're being asked to 'fess to a woman who is their Commander as well as their counsellor, a junior officer might be less willing to go to her with their troubles.
That was my take as well.
Pray patience, Worship, I but try to help!
Couldst thou forswear thy pompous attitude
And promise thou shalt ne'er call me that name?