the look it self – meaning a 3 qtr or long sleeve shirt under an appropriate sized and styled jumper is tzinus.
sadly, there is a mistaken impression that as long as the elbow, knee, collar bone and everything in-between is in someway covered, everything is fine. without getting into the whole argument of “well don’t look”, I think it is safe to say that this line of thinking is not correct, otherwise pants would be fine as would lycra items as you describe