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, 7 months ago by apushatayid. You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In