To those that said we hafta wear longer skirts- I want you to know that I am usually very makpid that my skirts be at least 3-4 inches under my knee. But when wearing a straight skirt- unless its 3 inches above your ankles, chances are that it will ride up when entering or exiting a car (especially a minivan!!!)
Like observanteen said- it is not practical to say dont wear straight skirts. Everyone is gonna wear them anyway. We just hafta find a way to be tznius while wearing them