One thing to remember, is stand with the aprons against your knees to minimize the distance for the angle to work with. I know I have some kilts that tend to try to keep the pleats close to the back of my knees as I normally stand and the aprons out. If they ar 6 inches forward of your knees then the apparent hem can move about 4.25 inches from floor to 7 foot camera position. (Sine function of right triangles, 45 degrees => 6" x .707 = 4.25")