There seems to be a machlokes between shmendrick and notasheep regarding the definition of “long skirt” according to Rav Falk.
According to shmendrick “Long skirts (ankle length)as asked by OP, considered a tznius problem per Oz V’Hadar Levushah by Rav Falk.”
According to the non sheep “The ‘long skirts’ that Rav Falk says are not tznius are those that go below the ankles and sweep the floor”
Unless of course shmendrick refers to women whose ankles sweep the floor?