I did not know that Star Trek had a uniform for night clubbing. Either the photo is flipped or the insignia is on the wrong side. (not that there is anything wrong with either side of the young lady!)The 1950s bubble helmet and silver suit has a June Lockhart vibe.
Personally I'd have said to just use the Terran Empire insignia from Mirror Mirror with that outfit.
The cutie in the sailor suit from "brave witches" (#2)
Oh I thought it was Mako from Kill la Kill.
I hope you don't mind but I steal from you frequently for my own cosplay posts. There is just something about a good model in a good costume that does it for me.