Not quite. The gray uniforms were made first, and those episode were filmed first. Then there was a production pause and a series re-tool, which included creating the new black uniforms, which were more expensive and more popular with JMS, who didn't have a kind word to say about the gray uniforms. But TNT claimed they didn't believe the first episodes filmed were "grabby" enough for a new show, so they decided the second half of production would be aired first, with a new first episode made with the black uniforms ("Warzone") in place of the original first episode that was already shot with the gray uniforms ("Racing the Night").
Since the black uniforms were more expensive and more liked behind-the-scenes, the next episode produced after the ones we got would've had Gideon deciding he was fed up with the gray uniforms and ordering that they be destroyed in an accident in the ship's laundry, so the crew would switch back to the black uniforms. So in the show, it would've been black to gray to black, but in reality, it had just been gray to black.
Some of the black uniform episodes were filmed with the understand they'd come after the gray uniform ones, and some before, which is one of the things that makes it so difficult to figure out an order that's consistent with the storyline and the uniforms. It also depends on how much of a hardass you are; for instance, I think "Warzone" shouldn't be watched at all, and "Racing the Night" should come first, because of all the exposition, but putting a gray-uniform episode first makes it impossible to build an order that incorporates the uniform change, since there has to be at least one black-uniform episode first.