AGT, if my memory serves, was nearly twenty years earlier (2391).
Uniforms seem to be a matter of preference, considering you have people in 2409 running around in uniforms from as far back as the 2150s, lol. Yeah, I know, game mechanics (or in this case, Cryptic making money, heh), but still.
I'm still waiting for other admiral's uniforms, dammit. One is not enough. (Well, two, if you count the TMP one, which is what it was intended to be.)