We had to do that, too — kneel and the hem had to touch the floor. Such sniveling at this prom, honestly. “I was embarassed.” That is appropriate.
After being sent home a few times(and catching pure hell from my mom) we figured a way around that morning inspection pass.
Second hour, they didn't pay attention to us any more as long as it wasn't a micro-mini. We'd roll our skirts up at the waist and be on our way. I don't think the male teachers minded our short skirts too much because they never said anything. lol
I like those prom dresses in this article.