To quote Rigged:

"Catholic School-girl skirts are pleated all the way around. Also, I've seen old paintings of traditional kilts that fall below the knee".

I posted this back in June, but at the Potomac Celtic festival, They had a lady (Some 80 years young) at the story tellers venue. She was born and raised in Scotland and now resides in the Shenandoah valley of Va. She mentioned that all of the students where she went to school in Scotland, boys and girls, wore kilts, but the girls didn't have sporrans. She also said that the girls' kilts were just like the boys' kilts.