This is a design for the uniform of a university Both these characters will visit at some point in the webcomic :>
Satsuki (r) wears her blazer buttoned up and her skirt low, keeping her classy noble personality in tact.
While Miharu (l) wears a slightly bigger sweater underneath her open blazer. Her skirt not being as low as Satsukis, mostly covered up by the sweater indicates her more carefree persona.