I asked a Rabbi and was told a girls skirt must extend approx 4 inches past the knee when standing so that when she sits bends…no part of her knee will be showing. How many women may be covering when they stand but the second thsy sit down WHOOPS?
And what if even at 4 In. it still goes up? Does that make it Muttar? What if at 3.5 In. it still stays down? Is that Assur?
(One of my pet peeves) I don’t disagree with the Halacha, but putting an inch length on it is just silly, and also a Nichshal to those whom the length is too short.