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I shall explain the setup these elf girls had to transfer to an all girls school in human world because they didn't read past the get out of school for 2 years line. Since the elf world is an all female world an exchange program with an all girls school makes it easier to adapt to the human world during their stay.
The reason the elf's uniforms are so short and lack of underwear is simple. dressing in skimpy/slutty clothes are even nothing at all is perfectly normal for them. Just as well as all kinds of sex & bondage play is an everyday common thing to do at home or to see people doing it out in public. And done even in their slice of life moe filled anime's too
From the elf's POV their just regular girls showing up for school dressed like they always have. However the human girls at the school were never told much about the elf world.
And the reason one is wearing shorts instead of a skirt is because she got tired of the cords on her vibrator getting caught on her chair to much back at her old school
