2350s
Fast-forwarding an entire generation, the Starfleet of TNG’s era decided to go back to big, bold colors—and a lot of black accents. The classic colors returned, but which division got them changed: red was now the color of Command, gold for Operations, and blue for Science. While this style of uniform would persist for two decades, it did feature some updates over that period that evolved, but didn’t outright replace the original design: most notably there was the transition from a one-piece jumpsuit to a two-piece collared jacket and trousers, but it also introduced a gender-neutral miniskirt option called the “Skant”.
https://gizmodo.com/star-trek-the-next-generation-s-must-watch-episodes-1842799574
