In Stargate Atlantis, the team going to Atlantis wears uniforms not seen before in Stargate: SG-1. They consist of a shirt & trousers covered with a jacket (very similar to later Star Trek: The Next Generation uniforms, actually).
Some are dark grey with maroon highlights, and some are tan with blue highlights. The color doesn't seem to indicate rank or science vs. military - characters are seen wearing both colors at different points during the show.
Is there any significance to the different colored uniforms on Stargate Atlantis, or is it just whichever color you choose to wear that day?