This uniform stands out to me as it has many elements of what I want in a Starfleet uniform and some that I so not. Let's break it down;
What works for me is the coat with the high collar. Very nice stuff! The cut is military without being 19th Century High Seas Over all I like the cut of this jib
I would certainly swap the black and red on the coat though, as the primary colours of the uniforms in Star Trek always work better with more colour than black. Keep the pants black though!
The other effect this would have is allowing the belt to be black and to lose the white "priest" collar effect. Neither really works for me in this image.
All in all I like this as a Class A and would love to see what a Class B would look like and also what a skirt/skant alternate would also look like.