[@Hammerman]

Well, well, that's certainly interesting. Let me see...

1 - The length of the skirt is officially set to bellow the knees, though the actual uniform everyone is provided with comes with a standard ankle length skirt. You character can always be one to play around technicalities, if she feels like it.

2 - Zipper, to make them easier and more comfortable. The ribbon is just additional decoration, though it has to be tied, not premade.

3 - As one bit of anachronism, I'm more in favor of modern style underwear being introduced a few decades before they became common place IRL.