It is for the 90s, manga and Crystal. But even in Stars in the manga they are still wearing these instead of their Eternal forms. I know for Black Moon/R the rest if the story was not fleshed out, but in the last story arc they keep them. I thought a lot on this. To be honest there is not much if any difference between the base uniforms and the ones after the upgrade done by Neo Queen Serenity. So my theory is that, while NQS could upgrade them that is all she could do as she lost her power to her heir. And the rest of the upgrades the Super and Eternal forms came from Usagi herself in the manga. And once she lost her power in the future the rest had to rely to the powers they were born with. Do you have any other theories? The easiest thing is to say inconsistencies, but it is always nice to try and find some valid explanation.