Signs in BP regarding Tznius (Skirts that fall 4" below the knee). Home › Forums › Decaffeinated Coffee › Signs in BP regarding Tznius (Skirts that fall 4" below the knee). This topic has 99 replies, 33 voices, and was last updated 13 years, 10 months ago by apushatayid. You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In