This officially became standard issue by Starfleet in the year 2351. (Decipher RPG module: Starfleet Operations Manual) By 2353, the uniform was in widespread use on bases and starships. (TNG episodes: "Suddenly Human", "The Battle") This uniform began to phase out of use in 2366 when new designs were adopted. However, these 2350s-2360s uniforms closely resembled the succeeding style and continued to be worn by some personnel until 2370. (TNG episode: "Evolution")