More uniform ideas:
1: The Terran Empire in the Mirror Universe would be more militaristic than the Federation, so instead of rank pips on the collar, the uniforms should either use "Wrath of Khan"-style rank insignia OR shoulder-boards with stripes like what Kirk wore in "Mirror, Mirror"
2: Phaser pistols a nice touch.
3: Troi's skirt isn't mini enough. Where is her sidearm? And if you feel so inclined, you could move her Empire insignia to dangle from a navel piercing. (Hey, she's BAD, isn't she?)
4: IIRC, Uhura kept her blade holstered in the top of her boot. That's where Troi's should go (or in a holster built-into the outside of the boot). Then her phaser pistol could go on her hip.