Some of the more disco-like beats seem dated, but that is about it. Tight skin female uniforms is sort of a sci-fi staple in Japan. They are lucky they aren't showing off a lot of skin. Though it might be nice for them to be in the regular uniforms, I suppose it was (A: tradition) and (B: unflatering for their figures).
The UNCF (Army) uniforms had a skirt while the UNCN (Navy) uniforms wer basically just like them men's uniform. Though what I guess in the Marines uniform has a skirt (Niimi wore a blue uniform with a skirt in Episode 2, but I think she is suppose to be in the same service as Sanada who was in green).