>>16223708speaking as a foot artist, it's because kronii's stockings are too solid black to show feet details the way pantyhose does, so the toes need to be opened up
it's also for variety when drawing all of council's feet:
>Baelz has light skin bare feet>Sana covers the dark skin bare feet >Mumei handles the classic pantyhose>Fauna has one stirrup but it's white and doesn't contrast much with the foot>Kronii can't be the solid pantyhose, that's taken by Mumei>Only option left is for Kronii to be the "light skin/dark fabric" contrasting look>Kronii therefore gets stirrups or torn stockings 