Disclosed is an overlapping, closable slit opening especially for nursing clothes, which is part of the seam that runs across the entire piece of clothing in a vertical, horizontal, or diagonal direction. Said overlapping, closable slit opening (2) is placed at the level of the breast and can be opened and closed by means of any type of closure (e.g. snap fasteners, zippers, etc.). The inventive, closable slit opening makes it possible to nurse in a comfortable and discreet manner without having to undress such that the nursing mother remains dressed in any case and is not exposed to any emotionally or physically unpleasant situation in public or in private. The overlapping, closable slit opening hides the nursing process in the used state.