Mirrior universe, seven of nine costume, Merc-set ect. (not actuall real FEDERATION uniforms like... TOS, TNG, DS9 or even the usual TOS uniform.... just... basicly.... everything else)
They have all we need,.... and if you are at captains table you'll actually see some KDF-NPC wearing parts of those and looking great (especially the TOS-mirror boots on orions or the grenedes from the merc set on Gorn caught my attention).
So no point in STILL locking those for us.
I know I am going to get flak, but I would support having the Bajoran uniform added to the KDF in additon the the Merc uniform, Seven of Nine, and the Generic Police uniform that has appeared in numerous episodes.
The reason I suggest the Bajoran uniform is that it is more generic than some people think. The World War II uniforms of the allied powers were more similar than people realize. I have seen some folk try to tell me the Soviet WWII Uniform (without their hats) was worn by the US during that period. While there are striking similarities, they were different, but I digress.