I believe there was one photo of one of the uniforms in one of the various Trek
coffee table books put out by Pocket in the late '90s. I can't remember which one. It was a sciences division uniform and had a caption explaining how the uniforms were scrapped at the last minute.
is definitely right that those are custom repaints; the actual Generations
figure line was also noteworthy for the horrendous lack of articulation (only hips, shoulders, waist and neck; not even knees and elbows) compared to either the TNG line that preceded it, or subsequent Playmates lines that would follow for VOY and First Contact