Captain McBain wrote:
In Encounter at Farpoint, when Q is first appearing to the crew in various outfits, Picard states that the military uniform Q shows up in is a 'costume.' I don't understand Picard's reasoning for this.
Well, because the uniforms showed off all the colorfull decorations for the person inside it. Starfleet uniforms dont do that anymore: They are plain, only show the rank and the function, but no decorations; they dont serve the ego of the officer, their purpose is not to impress.