I am not Spock wrote:
Wow, those TWOK uniforms are pretty long-serving, then! They hung onto them for a good 70, 80 years! They phased out the early TNG jumpsuits (for main characters) after two seasons!
Actually, a little bit longer. Remember, the early TNG uniforms were in use at least as early as 2364 (when Picard brings back Jack Crusher's corpse. So at least 11 years. Longer then the later TNG/DS9 ones.