2370s
Never let it be said that something like an existentially threatening war got in the way of Starfleet fashion. Just as the Dominion War was breaking out, Starfleet once again issued an updated uniform design, borrowing heavily from the jacketed uniforms of the 2350s and ‘70s. There were some major twists though, primarily in the jackets: division-specific shoulder patches were replaced with two-toned, padded black-and-grey variants, with the grey undershirts now being swapped to reflect the division colors.
https://gizmodo.com/star-trek-deep-space-nine-s-must-watch-episodes-1842983112
