Hi! I'm just wandering how to measure the length of the skirt properly as I ordered a leotard from another site a while ago and it said to tie a rope around the waist, put two fingers under the rope and then measure from there. Is that the same way we do it for your leotards? Or do we need to measure from the exact waist? (I tried to click on the 'how to measure' page but nothing came up) thank you!