In a parallel universe, the Celestial Union was a planetary alliance. Bajor was at its center and Earth, Cardassia and many other planets were members.

Starfleet and the Bajoran Militia once existed in the Union's universe and had been amalgamated by the 2370s. Its defense force uniforms were an amalgamation of the two forces uniforms.

The Union was once at war with the Tholians and it was during this conflict that Colonel Benjamin Sisko discovered the Bajoran wormhole. (DS9 novel: Fearful Symmetry)

The type of "amalgamated" uniform described here would probably be similar to the uniform of the alternate timeline Bajoran Ascendancy's branch of Starfleet, which was also described as a combination of Bajoran and Federation uniform styles.
Community content is available under CC-BY-SA unless otherwise noted.