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.
You have gone too far. You have married Fester, you have destroyed his spirit, you have taken him from us. All that I could forgive. But Debbie...