It is a casual look, best suited to evenings and weekends. When I do wear a knotted shirt to the office, I ensure no skin is visible at the waistline and that my outfit has no other casual elements.
Angie recently asked her readers what they thought of the knotted shirttail trend. Many were not a fan of the look, objecting to the reveal of skin, the bulk of the knot, or the unsuitability of the style for an apple shaped body or short torso. (I have a short torso, myself, but a slim upper half, so it isn't usually an issue.)
Do you like this look on yourself or others?